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Understanding the Effect of a Changing Climate on the Re-Emergence of Mosquito-Borne Diseases in Vulnerable Small Island Nations: A Systematic Review 了解气候变化对脆弱的小岛屿国家蚊媒疾病重新出现的影响:系统综述。
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-02-05 DOI: 10.1111/zph.13212
Mohabeer Teeluck, Oyelola Adegboye, Stephan Karl, Diana P. Iyaloo, Emma McBryde

Introduction

Drastic changes in meteorological variables due to climate change will likely have an implication on the proliferation of vectors such as mosquitoes. Extreme weather events may therefore promote the emergence/re-emergence of mosquito-borne diseases (MBDs) and potentiate the risk of endemicity, particularly, in small island nations.

Method

A systematic review was chosen to methodically ascertain the knowledge gaps that exist in determining the influence of the changing climate on MBDs in small islands with vulnerable public health systems. This review was conducted using the PRISMA guidelines.

Results

Following extraction of 600 articles from the databases, 16 studies were determined to meet the selection criteria. The majority of these research papers were from Sri Lanka (n = 9) while the remaining articles were distributed between islands in the Pacific and Atlantic Ocean. Several of these studies used regression modelling techniques to discuss the effect of multiple meteorological variables on the incidence of MBDs. A positive relationship was observed between temperature and the relative risk of MBDs in 72% of the papers. Rainfall enhanced dengue transmission in 84% of the studies included. All the articles discussing the effect of humidity illustrated a similar trend while wind speed was the only climatic variable demonstrating a negative relationship with MBDs.

Discussion

Considering the intricate nature of the non-linear exposure–response link is crucial when estimating the lagged effect of the changing climate on MBDs transmission. Other challenges associated with bias and confounders in the selected studies as well as meteorological data accessibility, were highlighted. Therefore, it was not possible to conclusively establish that the changing climatic variables do influence the spread of MBDs which accentuated the need for conducting further studies to illustrate the effect of changing weather variables on the incidence of MBDs, with an emphasis on vulnerable small island nations.

导言:气候变化引起的气象变量的剧烈变化可能会对蚊子等病媒的扩散产生影响。因此,极端天气事件可能促进蚊媒疾病的出现/再次出现,并增加地方性流行的风险,特别是在小岛屿国家。方法:采用系统综述的方法,系统地确定在确定气候变化对公共卫生系统脆弱的小岛屿MBDs的影响方面存在的知识差距。该审查是根据PRISMA指南进行的。结果:从数据库中提取600篇文章后,确定了16项研究符合选择标准。这些研究论文大多数来自斯里兰卡(n = 9),而其余的文章分布在太平洋和大西洋的岛屿之间。其中一些研究使用回归建模技术来讨论多种气象变量对mbd发病率的影响。72%的论文观察到温度与mbd的相对风险呈正相关。在纳入的84%的研究中,降雨增强了登革热传播。所有讨论湿度影响的文章都显示出类似的趋势,而风速是唯一显示与MBDs负相关的气候变量。讨论:在估计气候变化对MBDs传播的滞后效应时,考虑非线性暴露-响应联系的复杂性质是至关重要的。他们强调了与选定研究中的偏见和混杂因素以及气象数据可及性有关的其他挑战。因此,不可能最终确定不断变化的气候变量确实影响MBDs的传播,这就强调需要进行进一步的研究,以说明不断变化的天气变量对MBDs发病率的影响,重点是脆弱的小岛屿国家。
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引用次数: 0
Potential Zoonotic Infections Transmitted by Free-Ranging Macaques in Human–Monkey Conflict Areas in Thailand 泰国人猴冲突地区自由放养的猕猴可能传播的人畜共患传染病。
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-23 DOI: 10.1111/zph.13211
Sarin Suwanpakdee, Benjaporn Bhusri, Aeknarin Saechin, Chalisa Mongkolphan, Siriporn Tangsudjai, Parut Suksai, Supakarn Kaewchot, Rattana Sariwongchan, Piya Sereerak, Ladawan Sariya

Introduction

Nonhuman primates (NHPs) can transmit zoonotic diseases to humans because of their close genetic relationship, facilitating the cross-species transmission of certain pathogens. In Thailand, Macaca is the most common NHP genus and their inhabits area are in close proximity of human, particularly in urban and suburban areas, where frequent interactions with humans increase the risk of pathogen transmission. The risk is influenced by factors such as the type of pathogen, the mode of transmission (e.g. direct contact or vector-borne), and the density of human and macaque populations in the regions. This study aims to investigate potential zoonotic infections in free-ranging macaques residing in human–monkey conflict areas.

Methods

From 2014 to 2023, 2703 macaques across 29 provinces in Thailand were tested for 18 pathogens using PCR, RT-PCR, or real-time PCR. The associations between disease occurrence, demographic variables, and sample types of macaques were analysed using univariable and multivariable regression.

Results

The overall pathogen infection percentage was 35.7% (965/2703). Simian foamy virus (SFV) had the highest infection percentage at 52.5% (759/1446), followed by Herpesviridae at 41.4% (353/852), Plasmodium spp. at 1.8% (14/758), and hepatitis B virus at 0.1% (2/1403). Significant differences were observed among different sampling sites, macaque age groups, and species in infection proportion of SFV, and Herpesviridae.

Conclusions

Identifying the pathogens carried by macaques is crucial for preparing for potential disease epidemics and outbreaks.

简介:非人灵长类动物(NHPs)由于其密切的遗传关系,可以将人畜共患疾病传播给人类,促进了某些病原体的跨物种传播。在泰国,猕猴是最常见的NHP属,它们的栖息地靠近人类,特别是在城市和郊区,与人类的频繁相互作用增加了病原体传播的风险。这种风险受到病原体类型、传播方式(例如直接接触或媒介传播)以及该地区人类和猕猴种群密度等因素的影响。本研究旨在调查居住在人猴冲突地区的自由放养猕猴的潜在人畜共患病情况。方法:2014 - 2023年,对泰国29个省2703只猕猴进行了18种致病菌的PCR、RT-PCR和real-time PCR检测。使用单变量和多变量回归分析了疾病发生、人口统计学变量和猕猴样本类型之间的关系。结果:总病原菌感染率为35.7%(965/2703)。猿猴泡沫病毒(SFV)感染率最高,为52.5%(759/1446),其次是疱疹病毒科(41.4%)(353/852)、疟原虫(1.8%)(14/758)和乙型肝炎病毒(0.1%)(2/1403)。SFV和疱疹病毒科的感染比例在不同采样点、不同年龄组和不同种类的猕猴中存在显著差异。结论:鉴定猕猴携带的病原体对预防潜在的疾病流行和暴发至关重要。
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引用次数: 0
Clinical and Epidemiologic Review of Capnocytophaga Spp. Infections Identified at a Public Health Reference Laboratory—California, 2005–2021 2005-2021年加州公共卫生参考实验室中嗜碳细胞吞噬菌感染的临床和流行病学回顾
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-21 DOI: 10.1111/zph.13209
Rebecca A. Campagna, Emily A. Kelly, Duc J. Vugia, Hillary F. Berman Watson, Christina S. Browne, Joseph K. Lau, Curtis L. Fritz

Introduction

Capnocytophaga is a genus of bacteria that are commensal to the oral microbiome of humans and some animals. Some Capnocytophaga species are found in the human oral cavity and rarely cause disease in people; the species found in animals are zoönotic and can be transmitted to people via saliva. This study describes the clinical and epidemiologic features of patients from whom Capnocytophaga spp. were isolated from blood and other clinical specimens at the California state Microbial Diseases Laboratory.

Methods

Clinical information was obtained from laboratory submission forms and any accompanying medical records and/or from matching records in statewide hospital discharge and emergency department databases.

Results

During the 17-year study period (2005–2021), Capnocytophaga spp. were isolated in 48 specimens from 47 patients. Capnocytophaga canimorsus , which is a zoönotic species, represented 85% of the Capnocytophaga spp. identified to the species level. The median age was 67 years (range: 30–88 years) for the 42 patients infected with a zoönotic species of Capnocytophaga and 36 years (range: 12–65 years) for the four patients infected with a non-zoönotic species. Twenty-five (60%) patients with zoönotic species infections were male, compared to two (50%) patients with non-zoönotic species infections. Capnocytophaga spp. were most frequently isolated from blood (88%), and the most common case presentation was sepsis (45%). A dog or cat bite prior to diagnosis was reported for 14% of patients infected with a zoönotic species of Capnocytophaga. Records for 45% of patients indicated at least one pre-existing health condition associated with depressed immune function.

Conclusions

This study documented that Capnocytophaga spp. can cause rare, severe, invasive disease in mostly older or immunocompromised persons, often without documentation of a dog or cat bite. Providers are encouraged to consider Capnocytophaga spp. infection in immunocompromised pet owners presenting with sepsis, even in the absence of a known animal bite.

前言:嗜糖菌是一种与人类和一些动物的口腔微生物群共生的细菌属。一些嗜碳细胞噬菌存在于人类口腔中,很少引起人类疾病;在动物身上发现的种类是zoönotic,可以通过唾液传染给人。本研究描述了在加利福尼亚州微生物疾病实验室从血液和其他临床标本中分离到嗜碳细胞吞噬菌的患者的临床和流行病学特征。方法:临床信息从实验室提交表格和任何随附的医疗记录和/或从全州医院出院和急诊科数据库的匹配记录中获得。结果:在17年的研究期间(2005-2021年),从47例患者的48份标本中分离到嗜碳细胞噬菌。Capnocytophaga canimorsus为zoönotic种,占已鉴定的Capnocytophaga属的85%。42例感染zoönotic种碳吞噬菌的患者中位年龄为67岁(范围:30-88岁),4例感染non-zoönotic种碳吞噬菌的患者中位年龄为36岁(范围:12-65岁)。25例(60%)zoönotic种感染患者为男性,2例(50%)non-zoönotic种感染患者为男性。血液中最常见的是碳吞噬菌(88%),最常见的病例表现是败血症(45%)。据报道,14%感染zoönotic型嗜碳细胞吞噬症的患者在诊断前曾被狗或猫咬伤。45%的患者的记录表明至少有一种先前存在的健康状况与免疫功能低下有关。结论:本研究证明,嗜碳细胞噬噬菌可在大多数老年人或免疫功能低下者中引起罕见、严重、侵袭性疾病,通常没有狗或猫咬伤的记录。即使在没有已知动物咬伤的情况下,也鼓励提供者考虑免疫功能低下的宠物主人感染脓毒症。
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引用次数: 0
A Special Insight on the Causal Agents and Mode of Occurrence of Japanese Encephalitis (JE) Infections in Rural Regions of Assam, India 对印度阿萨姆邦农村地区日本脑炎(乙脑)感染的病因和发生方式的特殊见解。
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-16 DOI: 10.1111/zph.13210
Oli Talukdar, Satya Sundar Bhattacharya, Nayanmoni Gogoi

Introduction

Japanese Encephalitis (JE) is a life-threatening disease, especially in the Indian subcontinent. Knowledge about the nature and ecology of the dispersal of JE virus (JEV) vectors needs to be increased. This study mechanistically explores the ecology of JEV vectors and the mode and frequency of occurrence of Acute Encephalitis Syndrome (AES) and JEV infections.

Methods

We established a linear relationship between environmental variables and JEV infection by JEV vectors (mosquitoes)—Culex tritaeniorhynchus, Culex vishnui, and Culex pseudovishnui. The relative abundance of three mosquito species was evaluated, and the JE Sample Positivity Rate (SPR) and JE Case Fatality Rate (CFR) were computed.

Results

Culex vishnui had a high abundance in residential areas during the transition from hot-dry (77.34%) to hot-wet period (78.66%) at temperatures between 31°C and 34°C and relative humidity of 80%–85.3%; this period also coincided with occurrence of AES (39 cases in hot-dry and 88 cases in hot-wet period) and JE (8 instances in hot-dry and 31 cases in hot-wet period). JE infection dominated near rainfed rice fields (rainfall: R = 0.67 at p < 0.05; rainy days: R = 0.74, p < 0.01). SPR was up to 32.28%, and CFR was as high as 42.86%; JEV infection was concentrated in adult male humans near rice fields (15.66%).

Conclusions

Climate modulation over the years can influence the distribution of Culex vishnui and, hence, AES and JE cases. JEV infections tend to rise in JE hotspot regions, especially near rice fields. Thus, comprehensive epidemiological investigations will help prevent a silent outbreak of JE.

简介:日本脑炎是一种危及生命的疾病,特别是在印度次大陆。需要增加对乙脑病毒媒介传播的性质和生态的认识。本研究从机制上探讨了乙脑病毒传播媒介的生态学以及急性脑炎综合征(AES)和乙脑病毒感染的发生方式和频率。方法:建立环境变量与乙脑病毒传播媒介三带喙库蚊、视丘库蚊和伪视丘库蚊感染乙脑病毒的线性关系。测定3种蚊种的相对丰度,计算乙脑样本阳性率(SPR)和乙脑病死率(CFR)。结果:在温度31℃~ 34℃,相对湿度80% ~ 85.3%的环境下,居民小区湿热过渡时期维氏库蚊数量较高,占77.34% (78.66%);同时发生AES(干热期39例,湿热期88例)和乙脑(干热期8例,湿热期31例)。结论:多年来的气候调节影响了vishnui库蚊的分布,从而影响了AES和乙脑病例的分布。乙脑感染在乙脑高发区呈上升趋势,尤其是稻田附近。因此,全面的流行病学调查将有助于防止乙脑无声爆发。
{"title":"A Special Insight on the Causal Agents and Mode of Occurrence of Japanese Encephalitis (JE) Infections in Rural Regions of Assam, India","authors":"Oli Talukdar,&nbsp;Satya Sundar Bhattacharya,&nbsp;Nayanmoni Gogoi","doi":"10.1111/zph.13210","DOIUrl":"10.1111/zph.13210","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Introduction</h3>\u0000 \u0000 <p>Japanese Encephalitis (JE) is a life-threatening disease, especially in the Indian subcontinent. Knowledge about the nature and ecology of the dispersal of JE virus (JEV) vectors needs to be increased. This study mechanistically explores the ecology of JEV vectors and the mode and frequency of occurrence of Acute Encephalitis Syndrome (AES) and JEV infections.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We established a linear relationship between environmental variables and JEV infection by JEV vectors (mosquitoes)—<i>Culex tritaeniorhynchus, Culex vishnui,</i> and <i>Culex pseudovishnui</i>. The relative abundance of three mosquito species was evaluated, and the JE Sample Positivity Rate (SPR) and JE Case Fatality Rate (CFR) were computed.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p><i>Culex vishnui</i> had a high abundance in residential areas during the transition from hot-dry (77.34%) to hot-wet period (78.66%) at temperatures between 31°C and 34°C and relative humidity of 80%–85.3%; this period also coincided with occurrence of AES (39 cases in hot-dry and 88 cases in hot-wet period) and JE (8 instances in hot-dry and 31 cases in hot-wet period). JE infection dominated near rainfed rice fields (rainfall: <i>R</i> = 0.67 at <i>p</i> &lt; 0.05; rainy days: <i>R</i> = 0.74, <i>p</i> &lt; 0.01). SPR was up to 32.28%, and CFR was as high as 42.86%; JEV infection was concentrated in adult male humans near rice fields (15.66%).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Climate modulation over the years can influence the distribution of <i>Culex vishnui</i> and, hence, AES and JE cases. JEV infections tend to rise in JE hotspot regions, especially near rice fields. Thus, comprehensive epidemiological investigations will help prevent a silent outbreak of JE.</p>\u0000 </section>\u0000 </div>","PeriodicalId":24025,"journal":{"name":"Zoonoses and Public Health","volume":"72 4","pages":"337-348"},"PeriodicalIF":2.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143012903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
There Goes the Neighbourhood—A Multi-City Study Reveals Ticks and Tick-Borne Pathogens Commonly Occupy Urban Green Spaces 一项多城市的研究表明,蜱虫和蜱传病原体通常占据城市绿地。
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-16 DOI: 10.1111/zph.13208
Jani J. Sormunen, Satu Kylänpää, Ella Sippola, Riikka Elo, Nosheen Kiran, Veli-Matti Pakanen, Eva R. Kallio, Eero J. Vesterinen, Tero Klemola

Introduction

Humans acquire tick-borne pathogens (TBPs) from infected ticks contacted during outdoor activities. Outdoor activity is at its highest in urban green spaces, where the presence of tick populations has increasingly been observed. Consequently, more insight into factors influencing the presence of ticks therein is needed. Here, we assess the occurrence of ticks and several TBPs in urban green spaces in Finland, estimate related human hazard and assess how landscape features influence tick and TBP occurrence therein.

Methods

Ticks collected from five cities during 2019–2020 were utilised. Borrelia, Rickettsia, Neoehrlichia mikurensis, Anaplasma phagocytophilum , Babesia and TBEV were screened from ticks using qPCR. Various landscape features were calculated and utilised in generalised linear mixed models to assess their contribution towards tick and TBP occurrence in green spaces. Finally, human population density proximate to each study site was calculated and used to create population-weighted risk indices.

Results

Borrelia were the most common pathogens detected, with 22% of nymphs and 43% of adults infected. Increasing forest cover had a positive effect on the densities of nymphs and adults, whereas forest size had a negative effect. Middling percentages of artificial surfaces predicted higher nymph densities than low or high values. Human population-weighted risk estimates were highly varied, even within cities. A positive correlation was observed between total city population and risk indices.

Conclusions

Ticks and TBPs are commonplace in urban green spaces in Finland. Enzootic cycles for Borrelia and Rickettsia appear to be well maintained within cities, leading to widespread risk of infection therein. Our results suggest that nymph densities are highest in urban forests of medium size, whereas small or large forests show reduced densities. Green spaces of roughly similar risk can be found in cities of different sizes, emphasising that the identification of areas of particularly high hazard is important for effective mitigation actions.

人类在户外活动中接触受感染的蜱虫,获得蜱传病原体(TBPs)。户外活动在城市绿地中最为频繁,人们越来越多地观察到蜱虫种群的存在。因此,需要更深入地了解影响蜱虫存在的因素。本文评估了芬兰城市绿地中蜱虫和几种TBP的发生情况,估计了相关的人类危害,并评估了景观特征如何影响其中蜱虫和TBP的发生。方法:利用2019-2020年在全国5个城市采集的蜱虫。采用qPCR方法从蜱体中筛选出伯氏体、立克次体、米库伦新埃尔希体、嗜吞噬细胞无形体、巴贝斯虫和TBEV。在广义线性混合模型中,计算并利用各种景观特征来评估它们对绿地中蜱虫和TBP发生的贡献。最后,计算每个研究点附近的人口密度,并使用该密度创建人口加权风险指数。结果:伯氏疏螺旋体是最常见的致病菌,有22%的若虫和43%的成人感染。增加森林覆盖对若虫和成虫密度有积极影响,而森林面积对若虫和成虫密度有消极影响。中等百分比的人造表面预测若虫密度高于低或高百分比。即使在城市内,人口加权风险估计也存在很大差异。城市人口总数与风险指数呈正相关。结论:蜱虫和TBPs在芬兰城市绿地中普遍存在。伯氏疏螺旋体和立克次体的地方性动物循环似乎在城市内保持良好,导致城市内广泛存在感染风险。结果表明,若虫密度在中等规模的城市森林中最高,而小森林或大森林的若虫密度则降低。在不同规模的城市中可以找到风险大致相似的绿地,这强调了确定特别高危险的地区对于有效的减灾行动非常重要。
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引用次数: 0
Chronic Carriage of Leptospira interrogans Genotype Associated With the Australis Serogroup by Naturally-Infected Hedgehogs (Erinaceus europaeus) at a Wildlife Health Centre in Northwestern France 法国西北部野生动物卫生中心自然感染刺猬(Erinaceus europaeus)慢性携带与澳大利亚人血清群相关的钩端螺旋体基因型
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-10 DOI: 10.1111/zph.13206
Florence Ayral, Julie Botman, Marine Le Guyader, Eve Ramery, Philippe Gourlay

Background

Leptospirosis is a widespread zoonosis caused by bacteria in the genus Leptospira. Basic epidemiological information is crucial to mitigating disease risk but is lacking for leptospirosis; notably, the hosts responsible for maintaining Leptospira remain largely unknown. Frequently observed near human habitations, hedgehogs (Erinaceus europaeus) are taken to wildlife rescue centres when found sick or injured. Thus, they may pose a risk to human and animal health if they carry pathogenic Leptospira.

Aims

This study aimed to describe Leptospira carriage in a hedgehog population and the potential clinical impacts of the infection.

Material and Method

We investigated Leptospira carriage frequency and diversity in urine samples from 69 hedgehogs at a wildlife rescue centre, between April and June 2022. We used quantitative PCR, typing of the 16S rRNA and lfb1 genes, variable number tandem repeat and multispacer sequence typing to characterise Leptospira DNA. An analysis of urinary biochemical parameters was conducted to assess renal function.

Results

We detected Leptospira DNA in 25 (35%) of the urine samples, of which 21 were successfully typed. The latter analysis revealed a limited degree of genetic diversity. L. interrogans (n = 19) predominated, and the only genotype detected was related to the Australis serogroup (n = 17). We also noted the presence of L. borgpetersenii (n = 1) and L. kirschneri (n = 1). There was no relationship between infection status and urinalysis parameters.

Conclusion

These results suggest hedgehogs may act as long-term shedders of Leptospira in natural ecosystems.

背景:钩端螺旋体病是由钩端螺旋体属细菌引起的一种广泛存在的人畜共患病。基本的流行病学信息对减轻疾病风险至关重要,但缺乏钩端螺旋体病的信息;值得注意的是,负责维持钩端螺旋体的宿主在很大程度上仍然未知。刺猬(Erinaceus europaeus)经常在人类栖息地附近被观察到,当它们被发现生病或受伤时,就会被带到野生动物救援中心。因此,如果它们携带致病性钩端螺旋体,可能对人类和动物健康构成风险。目的:本研究旨在描述刺猬种群中钩端螺旋体的携带情况及其感染的潜在临床影响。材料和方法:我们在2022年4月至6月期间调查了野生动物救援中心69只刺猬尿液样本中的钩端螺旋体携带频率和多样性。我们使用定量PCR、16S rRNA和lfb1基因分型、可变数串联重复和多间隔序列分型来表征钩端螺旋体的DNA。通过分析尿液生化指标来评估肾功能。结果:在25份(35%)尿样中检出钩端螺旋体DNA,其中21份成功分型。后一种分析揭示了有限程度的遗传多样性。以疑问乳杆菌(n = 19)为主,唯一检测到的基因型与Australis血清组相关(n = 17)。我们还注意到L. borgpetersenii (n = 1)和L. kirschneri (n = 1)的存在。感染状况与尿液分析参数无相关性。结论:在自然生态系统中,刺猬可能是钩端螺旋体的长期传播者。
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引用次数: 0
Prevalence of Multiple RNA Virus Infections in Nine Types of Commonly Used Laboratory Animals in China 中国九种常用实验动物多重RNA病毒感染流行情况
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2025-01-07 DOI: 10.1111/zph.13207
Qiyu He, Jingyi Shu, Zhaochao Liang, Manyu Li, Shuangshuang Li, Tianxu Liu, Xinyue Yang, Qinghui Lu, Ling Wang, Lin Wang

Introduction

Laboratory animals are widely used in biomedical research. Surveillance of naturally occurring virus in laboratory animals is important to fully understand the results of animal experiment, control laboratory-acquired infections among research personnel and manage viral transmission within laboratory animal populations. This study aimed to investigate the prevalence of multiple RNA viruses in laboratory animals commonly used in China.

Methods

We screened viral RNA for five different potentially zoonotic RNA viruses (astrovirus, coronavirus, hepevirus, hepatovirus and picornavirus) that can be transmitted via the faecal-oral route in 759 faecal samples collected from nine commonly used laboratory animals (mice, rats, monkeys, rabbits, pigs, dogs, ferrets, goats and tree shrews) in China. Viral RNA was screened by broad-spectrum reverse transcription polymerase chain reaction (RT-PCR) using primers annealing in genome-conserved regions. The laboratory mice and rats used in this study were specific-pathogen-free. The other laboratory animals were conventional animals.

Results

At least one selected virus was detected in each of the nine sampled laboratory animal types, except tree shrews. The total positive rates of viral RNA for astroviruses, coronaviruses, hepeviruses and picornaviruses in the selected laboratory animals were 4.3%, 7.6%, 8.0% and 1.1%, respectively. Among these, the positivity rates for hepevirus RNA in laboratory ferrets (41.3%) and rabbits (17.8%), astrovirus RNA in laboratory pigs (75.0%) and coronavirus RNA in laboratory ferrets (45.7%) were relatively high. Viral RNA for hepatovirus was negative in all selected laboratory animals. Co-infection with multiple viruses has also been observed in laboratory dogs, pigs, ferrets and rabbits.

Conclusions

Our findings highlight the need for the surveillance of natural viral infections in laboratory animals.

实验动物广泛应用于生物医学研究。对实验室动物中自然发生的病毒进行监测对于充分了解动物实验结果、控制研究人员之间的实验室获得性感染和管理实验室动物种群内的病毒传播具有重要意义。本研究旨在调查中国常用实验动物中多种RNA病毒的流行情况。方法:从中国9种常用实验动物(小鼠、大鼠、猴子、家兔、猪、狗、雪貂、山羊和树鼩)的759份粪便样本中筛选可通过粪-口途径传播的5种潜在人畜共患RNA病毒(星状病毒、冠状病毒、肝炎病毒、肝病毒和小核糖核酸病毒)。利用广谱逆转录聚合酶链反应(RT-PCR)在基因组保守区进行引物退火筛选病毒RNA。本研究使用的实验小鼠和大鼠均无特异性病原体。其他实验动物都是常规动物。结果:除树鼩外,在9种实验动物中均检测到至少一种选定病毒。在所选实验动物中,星状病毒、冠状病毒、肝炎病毒和小核糖核酸病毒的RNA总阳性率分别为4.3%、7.6%、8.0%和1.1%。其中,实验雪貂的肝炎病毒RNA(41.3%)和家兔(17.8%)、实验猪的星状病毒RNA(75.0%)和实验雪貂的冠状病毒RNA(45.7%)的阳性率较高。在所有选定的实验动物中,肝病毒RNA均为阴性。在实验犬、猪、雪貂和家兔中也观察到多种病毒的共同感染。结论:我们的发现强调了在实验动物中监测自然病毒感染的必要性。
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引用次数: 0
Detection of a Reassortant Swine- and Human-Origin H3N2 Influenza A Virus in Farmed Mink in British Columbia, Canada 加拿大不列颠哥伦比亚省养殖水貂中猪源和人源重组H3N2甲型流感病毒的检测
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2024-12-29 DOI: 10.1111/zph.13205
Kevin S. Kuchinski, John Tyson, Tracy Lee, Susan Detmer, Yohannes Berhane, Theresa Burns, Natalie A. Prystajecky, Chelsea G. Himsworth

Introduction

In December 2021, influenza A viruses (IAV) were detected in a population of farmed mink in British Columbia, Canada. Circulation of IAVs in farmed mink populations has raised public health concerns due to similarities between mustelid and human respiratory physiology, potentially facilitating spillover of zoonotic influenzas from livestock.

Methods

Oropharyngeal specimens were collected from mink as part of a surveillance program for SARS-CoV-2. Diagnostic RT-qPCR testing was performed using a multiplex assay targeting SARS-CoV-2, IAV, influenza B virus and respiratory syncytial virus. Whole viral genome sequencing was conducted on IAV-positive specimens, followed by phylogenetic analysis with other animal and human IAV genome sequences from large global databases.

Results

IAVs were detected in 17 of 65 mink by RT-qPCR. Based on genomic sequencing and phylogenetic analysis, these IAVs were subtyped as H3N2s that originated from reassortment of swine H3N2 (clade 1990.4 h), human seasonal H1N1 (pdm09) and swine H1N2 (clade 1A.1.1.3). This reassortant has been subsequently observed in swine in several Midwest American states, as well as in swine and turkeys in Ontario, suggesting its spillover into farmed mink in British Columbia was incidental to its broader dissemination in North American swine populations.

Conclusions

These detections reaffirm the need for extensive genomic surveillance of IAVs in swine populations to monitor reassortments that might become public health concerns. They also highlight the need for closer surveillance of IAVs in mink to preserve animal health, protect agricultural interests, and monitor potential zoonotic threats.

2021年12月,在加拿大不列颠哥伦比亚省的养殖水貂种群中检测到甲型流感病毒(IAV)。由于麝香菌与人类呼吸生理学的相似性,在养殖水貂种群中传播的iav引起了公共卫生关注,可能促进牲畜人畜共患流感的外溢。方法采集水貂口咽标本,作为SARS-CoV-2监测项目的一部分。采用针对SARS-CoV-2、IAV、乙型流感病毒和呼吸道合胞病毒的多重检测方法进行诊断性RT-qPCR检测。对IAV阳性标本进行全病毒基因组测序,然后与全球大型数据库中的其他动物和人类IAV基因组序列进行系统发育分析。结果65只水貂中有17只经RT-qPCR检测到iav。根据基因组测序和系统发育分析,这些病毒亚型为H3N2s,源自猪H3N2(进化支1990.4 h)、人季节性H1N1 (pdm09)和猪H1N2(进化支1A.1.1.3)的重组。这种重组随后在美国中西部几个州的猪以及安大略省的猪和火鸡中被观察到,这表明它在不列颠哥伦比亚省的养殖水貂中的外延是它在北美猪群中广泛传播的偶然事件。这些检测结果再次表明,需要对猪群中的iav进行广泛的基因组监测,以监测可能成为公共卫生问题的重组。他们还强调需要更密切地监测水貂中的iav,以保护动物健康,保护农业利益,并监测潜在的人畜共患威胁。
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引用次数: 0
Anticoagulants for the Control of the Common Vampire Bat (Desmodus rotundus) 控制普通吸血蝙蝠的抗凝血剂。
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2024-12-22 DOI: 10.1111/zph.13196
Laura Ávila-Vargas, Diego Soler-Tovar, Quan Dong, Luis E. Escobar

Background

In Latin America, there is a high incidence of vampire bat-transmitted rabies in cattle causing increased mortality of livestock, which heavily impacts the agricultural sector. Anticoagulants-based control methods for the common vampire bat (Desmodus rotundus) have been employed continuously since the 1970s with various methods of application, presentations, doses and active ingredients. Studies from half a century ago still serve as a reference for the current use of anticoagulants for bat-borne rabies control in Latin America. The objective of this study was to structurally and bibliometrically review literature on the use of anticoagulants for the control of D. rotundus as a means of rabies control.

Materials & Methods

Scientific literature on the use of anticoagulant products for D. rotundus control was obtained, reviewed and analysed. Articles were retrieved from Scopus and Web of Science databases. Research articles from 1971 to 2021 in Spanish, English and Portuguese were included in the review. Results were visualised using RStudio, Bibliometrix and VOSviewer.

Results

The body of literature indicates effectiveness of up to 100% in the use of anticoagulants to induce bat mortality. The effectiveness of anticoagulants for rabies control, however, remains uncertain. No evidence was found to support or refute the use of anticoagulants for rabies control.

Discussion

Instead, literature suggests that disturbing bat colonies increases rabies prevalence. This finding suggests that anticoagulants may have the opposite intended effect on rabies control and highlights the importance of further research on the practical methods for bat-borne rabies prevention.

Conclusion

Field experimental studies that include control groups over areas and periods that account for D. rotundus ecology are needed to determine the effectiveness of anticoagulants for rabies control in livestock. In conclusion, the use of anticoagulants for rabies control is questionable.

背景:在拉丁美洲,牛中吸血蝙蝠传播的狂犬病发病率很高,导致牲畜死亡率增加,严重影响农业部门。自20世纪70年代以来,以抗凝血剂为基础的普通吸血蝙蝠(圆齿蝠)控制方法一直在使用,其应用方法、表现形式、剂量和有效成分各不相同。半个世纪前的研究仍可作为拉丁美洲目前使用抗凝血剂控制蝙蝠传播狂犬病的参考。本研究的目的是从结构和文献计量学的角度回顾有关使用抗凝剂控制圆形弧菌作为狂犬病控制手段的文献。材料与方法:查阅有关使用抗凝产品防治圆锥虫的科学文献,对其进行回顾和分析。文章从Scopus和Web of Science数据库中检索。从1971年到2021年,西班牙语、英语和葡萄牙语的研究文章被纳入了回顾。使用RStudio、Bibliometrix和VOSviewer对结果进行可视化。结果:大量文献表明,使用抗凝血剂诱导蝙蝠死亡的有效性高达100%。然而,抗凝剂对狂犬病控制的有效性仍不确定。没有证据支持或反对使用抗凝剂控制狂犬病。讨论:相反,文献表明打扰蝙蝠群落会增加狂犬病的流行。这一发现表明,抗凝剂可能对狂犬病控制产生相反的效果,并强调了进一步研究蝙蝠传播的狂犬病预防实用方法的重要性。结论:为了确定抗凝血剂对家畜狂犬病控制的有效性,需要进行现场实验研究,包括在考虑圆形田鼠生态的地区和时期的对照组。总之,使用抗凝血剂控制狂犬病是值得怀疑的。
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引用次数: 0
Exposure to West Nile Virus in Wild Lagomorphs in Spanish Mediterranean Ecosystems 西班牙地中海生态系统野生狐猴暴露于西尼罗病毒
IF 2.4 2区 农林科学 Q3 INFECTIOUS DISEASES Pub Date : 2024-12-18 DOI: 10.1111/zph.13200
Sabrina Castro-Scholten, Javier Caballero-Gómez, Daniel Bravo-Barriga, Francisco Llorente, David Cano-Terriza, Miguel Ángel Jiménez-Clavero, Débora Jiménez-Martín, Leonor Camacho-Sillero, Ignacio García-Bocanegra

Background

West Nile virus (WNV) is the most widely distributed mosquito-borne flavivirus. Over the past decade, its spread across Europe has raised significant concerns for both public and animal health. Although WNV exposure has been evidenced in various wild mammal species in Spain, no seroepidemiological studies have been conducted on this flavivirus in wild lagomorphs so far.

Aim

This study aimed to assess WNV exposure in European wild rabbit (Oryctolagus cuniculus) and Iberian hare (Lepus granatensis) populations inhabiting Spanish Mediterranean ecosystems.

Methods

Sera from 540 wild lagomorphs (399 European wild rabbit and 141 Iberian hares), from 106 hunting grounds distributed throughout Andalusia (southern Spain), were collected between the 2018/2019 and 2022/2023 hunting seasons.

Results

Antibodies against flavivirus were detected by blocking enzyme-linked immunosorbent assay (bELISA) in 5.0% (27/540; 95% CI: 3.2–6.8) of the wild lagomorphs. Exposure to WNV was confirmed in 4.8% (19/394; 95% CI: 2.7–6.9) of wild rabbits and 0.7% (1/141; 95% CI: 0.0–2.1) of Iberian hares by virus microneutralisation test. Anti-WNV antibodies were found in wild lagomorphs sampled from three (2.8%) hunting grounds located in western Andalusia during the seasons 2020–2021 and 2021–2022. Remarkably, this spatiotemporal distribution overlaps with the largest outbreak of WNV in Spain. Antibodies against Usutu virus and Bagaza virus were not detected in the wild lagomorph populations analysed.

Conclusions

This study constitutes the first report of WNV exposure in wild rabbit in Spain and in Iberian hare worldwide. While these species seem not play a primary role in the epidemiology of the virus, they could serve as sentinel for monitoring WNV in Iberian Mediterranean ecosystems.

背景:西尼罗河病毒(WNV)是分布最广泛的蚊媒黄病毒。在过去的十年中,它在欧洲的传播引起了公众和动物健康的重大关注。尽管在西班牙的各种野生哺乳动物中已证实有西尼罗河病毒暴露,但迄今尚未对野生狐猴中这种黄病毒进行血清流行病学研究。目的:本研究旨在评估居住在西班牙地中海生态系统中的欧洲野兔(Oryctolagus cuniculus)和伊比拉野兔(Lepus granatensis)群体的西尼罗河病毒暴露情况。方法:在2018/2019年至2022/2023年的狩猎季节,采集西班牙南部安达卢西亚地区106个猎场的540只野生兔(欧洲野兔399只,伊比利亚野兔141只)的血清。结果:阻断酶联免疫吸附试验(bELISA)在5.0% (27/540;95% CI: 3.2-6.8)。4.8% (19/394;95% CI: 2.7-6.9), 0.7% (1/141;95%置信区间:0 ~ 2.1)。在2020-2021年和2021-2022年期间,在安达卢西亚西部三个狩猎场取样的野生lagomorphs中发现了抗西尼罗河病毒抗体(2.8%)。值得注意的是,这一时空分布与西班牙最大的西尼罗河病毒暴发重叠。在分析的野生lagomorth种群中未检测到Usutu病毒和Bagaza病毒抗体。结论:本研究是西班牙野兔和世界范围内伊比利亚野兔中首例西尼罗河病毒暴露报告。虽然这些物种似乎在该病毒的流行病学中没有发挥主要作用,但它们可以作为监测伊比利亚地中海生态系统中西尼罗河病毒的哨兵。
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Zoonoses and Public Health
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