{"title":"A preliminary note on routine culture methods for Endamoeba histolytica.","authors":"B ANASTOPOULOS","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 3","pages":"240-2 Also Spanish transl., 243-5"},"PeriodicalIF":0.0,"publicationDate":"1949-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27162093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The effect of chloramine on the miracidia of Schistosoma mansoni.","authors":"N BIAGGI, R PIRAZZI","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 3","pages":"246-50 Also Spanish transl., 251-5"},"PeriodicalIF":0.0,"publicationDate":"1949-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Immunity in bacillary dysentery.","authors":"L M GONZALEZ, P MORALES OTERO","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 3","pages":"221-9 Also Spanish transl., 230-9"},"PeriodicalIF":0.0,"publicationDate":"1949-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rodents and fleas in a plague epizootic in a rural area of California.","authors":"K F MEYER, R HOLDENRIED","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 3","pages":"201-9 Also Spanish transl., 210-20"},"PeriodicalIF":0.0,"publicationDate":"1949-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Syphilis; review of recent medical literature.","authors":"F W REYNOLDS, J E MOORE","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 3","pages":"256-92"},"PeriodicalIF":0.0,"publicationDate":"1949-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Leptospirosis in Puerto Rican wild rats.","authors":"J H RUST","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 2","pages":"105-12. Also Spanish transl., 113-20"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"San Juan Bay and adjacent waters; preliminary report of a pollution survey.","authors":"J RIVERA LEON, N BIAGGI, R PIRAZZI REXACH","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 2","pages":"150-66. Also Spanish transl., 167-76"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"First report of leptospirosis canicola in the dog in Puerto Rico.","authors":"C I BOYER, G J DAMMIN, F M REYES","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 2","pages":"177-84. Also Spanish transl., 185-93"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27149285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The incidence of filariasis bancrofti in government institutions for children in Puerto Rico.","authors":"J F MALDONADO, F HERNANDEZ MORALES","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"24 2","pages":"121-34. Also Spanish transl., 135-49"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27161732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1948-09-01DOI: 10.4269/AJTMH.1948.S1-28.645
J. Maldonado, J. Acosta-Matienzo, F. VELEZ-HERRERA
Summary and Conclusions 1. A total of 1997 normal looking eggs of Schistosoma mansoni, representing 63 different fresh stool samples from a single patient, were isolated in rain water, each to a vial, and studied in respect to hatchability and in respect to the longevity and infectivity of the liberated miracidia. 2. The data on hatching demonstrate the following: a. Hatchability varied markedly from day to day, but the overall average was high, 83.6 per cent. b. Hatching was spread over a relatively long time. Sixty-five per cent of the eggs that hatched did so during the first 8 hours in water; an additional 24 per cent hatched during the next 16 hours. Of the rest, 9.5 per cent hatched on the second, and 1.5 per cent on the third day. c. Light acted as a definite stimulus to hatching. 3. Mortality among groups of miracidia held for different hour-intervals increased with advancing age. At nine hours, it reached 100 per cent. 4. Only one out of a batch of 112 miracidia attained a life span of eight hours and forty-two minutes. The average span of life was five to six hours. Further trials using river water gave practically the same results. The life expectancy of the miracidium of S. mansoni is therefore much shorter than previously supposed. 5. About three-fourths of the miracidia which came in contact with the snail immediately after hatching succeeded in accomplishing penetration. Infectivity remained about the same, irrespective of age, for as long as the larvae retained their vitality. Among those miracidia which failed to penetrate, some did so after repeated attacks while others remained indifferent to the snail throughout. 6. The proportion of miracidia which ultimately accomplished penetration (the overall infectivity rate) was found to be about two-thirds among those larvae that came in contact with the snail within two hours of free life. It gradually decreased to zero within eight to nine hours of free life. 7. The present study strongly suggests that even limited water pollution may bring about ample infection of snails.
{"title":"Biological studies on the miracidium of Schistosoma mansoni.","authors":"J. Maldonado, J. Acosta-Matienzo, F. VELEZ-HERRERA","doi":"10.4269/AJTMH.1948.S1-28.645","DOIUrl":"https://doi.org/10.4269/AJTMH.1948.S1-28.645","url":null,"abstract":"Summary and Conclusions\u00001. \u0000A total of 1997 normal looking eggs of Schistosoma mansoni, representing 63 different fresh stool samples from a single patient, were isolated in rain water, each to a vial, and studied in respect to hatchability and in respect to the longevity and infectivity of the liberated miracidia.\u00002. \u0000The data on hatching demonstrate the following:\u0000a. \u0000Hatchability varied markedly from day to day, but the overall average was high, 83.6 per cent.\u0000b. \u0000Hatching was spread over a relatively long time. Sixty-five per cent of the eggs that hatched did so during the first 8 hours in water; an additional 24 per cent hatched during the next 16 hours. Of the rest, 9.5 per cent hatched on the second, and 1.5 per cent on the third day.\u0000c. \u0000Light acted as a definite stimulus to hatching.\u00003. \u0000Mortality among groups of miracidia held for different hour-intervals increased with advancing age. At nine hours, it reached 100 per cent.\u00004. \u0000Only one out of a batch of 112 miracidia attained a life span of eight hours and forty-two minutes. The average span of life was five to six hours. Further trials using river water gave practically the same results. The life expectancy of the miracidium of S. mansoni is therefore much shorter than previously supposed.\u00005. \u0000About three-fourths of the miracidia which came in contact with the snail immediately after hatching succeeded in accomplishing penetration. Infectivity remained about the same, irrespective of age, for as long as the larvae retained their vitality. Among those miracidia which failed to penetrate, some did so after repeated attacks while others remained indifferent to the snail throughout.\u00006. \u0000The proportion of miracidia which ultimately accomplished penetration (the overall infectivity rate) was found to be about two-thirds among those larvae that came in contact with the snail within two hours of free life. It gradually decreased to zero within eight to nine hours of free life.\u00007. \u0000The present study strongly suggests that even limited water pollution may bring about ample infection of snails.","PeriodicalId":85764,"journal":{"name":"The Puerto Rico journal of public health and tropical medicine","volume":"26 1 1","pages":"85-91; Spanish transl 92-9"},"PeriodicalIF":0.0,"publicationDate":"1948-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70574128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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