QR link for World Health Organization : Regioinal Office for Africa ; Year 1993 ; Africa Region, 6403, Ex.196, No. 03.02: A Serological Survey on Arborvirus Infections in Kenya
Add to Book Shelf
Flag as Inappropriate
Email this Book

World Health Organization : Regioinal Office for Africa ; Year 1993 ; Africa Region, 6403, Ex.196, No. 03.02: A Serological Survey on Arborvirus Infections in Kenya

By World Health Organization


Description
Medical Reference Publication

Excerpt
Filarial mosquitos are dissected as a routine in many parts of the world, yet little information is available about the natural mortality of these vectors. The results of dissections are recorded as the percentage of female mosquitos containing filarial larvae at all stages of development-the infection rate-and the percentage of females containing mature infective filarial larvae-the infectivity rate. The proportion of mosquitos carrying infective parasites can be used, as Macdonald (1957) has shown, to estimate mosquito survival. For example, in Cz~lexfa tigans, if females carrying infective larvae of Wzrclzereria bancrofti can be assumed to have survived at least ten days, which is about the minimum period frcm ingestion of the microfilariae to the development of the infective stage, then the probability of survival over one day is given by lo\/ of the ratio of the number of mosquito~ w ith infective larvae to the total number of infected mosquitos. But few mosquitos survive long enough for the conlplete development of the parasite, or infective larvae nlay be lost when the mosquito feeds, and the number of mosquitos collected with infective filarial larvae is usually low, often too low to provide reliable estimates of inortality by this method alone.

Table of Contents
NA

 
 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.