Indian journal of malariology最新文献

Various autoantibodies like anti-nuclear antibodies (ANA), anti-double stranded DNA (anti-dsDNA), anti-histone antibodies (AHA), anti-neutrophil cytoplasmic antibodies (ANCA), anti-myeloperoxidase (anti-MPO), anti-proteinase3 (anti-PR3) and anti-lactoferrin (anti-LF) antibodies were studied in 173 acute hospitalised patients suffering from malaria of which 160 patients had P. falciparum and remaining 13 had P. vivax infection. Standard methods like indirect immunofluorescence (IIF) microscopy along with Confocal microscopy and ELISA were used for identifying and quantifying the autoantibodies and IIF patterns on PMN and HL-60 cells were studied for ANCA classification. Also HEp-2 cells were used for ANA detection, while estimation of anti-dsDNA, AHA, anti-MPO, anti-PR3 and anti-LF were tested using ELISA. Sera from malaria patients showed prominent immunofluorescence staining patterns where 23.8% cases had ANA in P. falciparum group as compared to 15.4% in P. vivax group and ANCA was found to be present in 20% in P. falciparum and 15.4% in P. vivax group. An interesting observation was that, of the total ANCA positives, 59% had p-ANCA, 5.9% had c-ANCA and 44.1% of the cases showed the 'atypical' or X-ANCA pattern. When p-ANCA positivity was compared with c-ANCA positivity among these patients, a good statistical correlation was noted with OR = 16, chi 2 = 16.43, EF = 0.46 and p-value = 5.037E 0.5. ELISA showed 31.2% anti-MPO and 6.2% anti-PR3 in P. falciparum cases while the two ANCA positive cases in P. vivax had anti-MPO. Anti-LF was found to be present in 40.6% cases. Neither the P. falciparum nor P. vivax contained autoantibodies with specificities similar to the characteristic lupus autoantibodies such as double stranded DNA (dsDNA). ANCA positivity develops in some types of malarial infection also with the presence of various autoantibodies which is important from a clinical point of view and should be carefully evaluated in those geographic areas where malaria is endemic. It also alerts us to the fact, whether in cases of repeated malarial infections in susceptible individuals, vasculitic disorders, which through ANCA pathways develop, could lead to renal and other complications.

Operational feasibility and bio-efficacy of alphacypermethrin treated curtains was evaluated in slum settlements of Andrews Ganj, New Delhi. Jute curtains treated with alphacypermethrin @ 100 mg/m2 were fixed on windows, doors and eves before on set of transmission and evaluations were carried out for two years. Entomological evaluation revealed that jute curtains treated with alphacypermethrin in Slum-I resulted drastic reduction in daytime indoor resting mosquitoes such as An. stephensi, Ae. aegypti and Cx. quinquefasciatus. Similarly, malaria incidence also reduced in the treated curtain used area when compared to that of in untreated curtain and without curtain areas. Bioassay tests on An. stephensi and Cx. quinquefasciatus showed that alphacypermethrin could produce > 70 per cent mortality up to six months in case of An. stephensi--a principal urban malaria vector and hence two rounds of treatment are sufficient in an year to protect inhabitants from malaria. The study indicates alphacypermethrin treated curtains could curtail malaria transmission in slum settlements and is operationally feasible in small houses and is also cost-effective.

Two hundred and forty-six apparently healthy pregnant women aged 19-40 years, without symptoms were recruited (147 recruited during the dry season and 99 recruited during the rainy season) for the present study. Blood examinations for malaria parasites, Plasmodium falciparum specific-IgG concentration and serological reactivity with P. falciparum-histidine rich protein-2 (HRP-2) antigens were conducted on all the pregnant women during the dry and rainy seasons of the year. During the dry season, 109 (74%) of the recruited pregnant women without symptoms had P. falciparum parasitaemia, while 79 (80%) of the recruited pregnant women without symptoms had P. falciparum parasitaemia during the rainy season. However, the P. falciparum malaria parasites density was significantly raised during the dry season compared with that of in the rainy season (p < 0.05). Serological analysis with P. falciparum histidine rich protein-2 antigen (HRP-2) showed 108 (73%) and 71 (77%) of the pregnant women without symptoms as seropositive during the dry and rainy seasons respectively. The P. falciparum specific-IgG concentration was similar during both seasons in the HRP-2 seropositive pregnant women without symptoms (p > 0.05). The results showed no seasonal tide in the incidences of asymptomatic P. falciparum parasitaemia; however, the significantly raised parasitaemia during the dry season may suggest possible increased parasites tolerance. The P. falciparum specific-IgG concentration during both seasons may not be the primary effector mechanism offering tolerance in asymptomatic parasitaemia in pregnant women.

Malaria endemicity in lower Myanmar has been studied to identify the causes for the prevalence of malaria in Yeasitkan village of lower Myanmar. Vector mosquitoes were collected by mosquito net in cattlesheds and in human dwellings (indoor and outdoor) by biting and catching procedure for the identification of species, insecticide susceptibility test and sporozoites detection. Larvae of mosquitoes were also collected in and around the village for vector identification and for breeding sources. Malaria infection in humans was examined by blood examination and blood antibody detection by ELISA method. Results showed that malaria infection was 43.2% in children under 10 years of age and An. dirus and An. minimus were found as main vectors. Total parasite positive rate was found to be 41.28% and in this 78.87% were P. falciparum infections and remaining 18.31% were of P. vivax. Spleen positive rate has been found very high in children between 2 and 9 years (52.94%). Study indicates that villages near to dam areas are more prone to malaria infection.

A total of 37 species of mosquitoes belonging to nine genera--Anopheles, Aedes, Armigeres, Culex, Harpagomyia, Mansonia, Orthopodomyia, Toxorhynchites and Uranotaenia were collected from Little Andaman Island. Mosquitoes of nine Anopheles group of species--An. barbirostris, An. barbumbrosus, An. balabacensis, An. insulaeflorum, An. kochi, An. philippinensis, An. roperi, An. sundaicus and An. vagus were recorded. An. philippinensis was found to be the most predominant species. Species-specific breeding preference and association in various types of acquatic habitats have been reported. This is the first record of mosquito fauna of Little Andaman Island.

In the present study, HLA associations among the cohort of 171 severe P. falciparum malaria patients were compared with that of 101 normal sex, age and ethnically matched control samples. All these individuals lived in Mumbai in an area of low and seasonal P. falciparum transmission. HLA A, B, DRB1 and DQB1 antigens were serologically (A and B) and molecularly (DRB and DQB) determined using isolated lymphocytes and genomic DNA following the microlymphocytotoxicity assay and PCR-SSP techniques. Significant differences were observed between patients with malaria and controls in the following groups of alleles: A3, B27, B49, DRB1*04, and DRB1*0809 were increased, while A19, A34, B18, B37, and DQB1*0203 were decreased. HLA B49 and DRB1*0809 were found to be positively associated with the complicated severe malaria patients (OR = 13.88; p < 0.0001). HLA A19, B5 and B13 were protective in patients with high parasite index (> 2%). These observations revealed the importance of ethnic background, which has to be taken into consideration while developing an ideal malaria vaccine. Further, when compared to HLA associations of other world populations the present study indicates the relative importance of different HLA alleles that may vary in different populations.