Effect of Plasmodium Falciparum on Blood Feeding Behavior of Naturally Infected Anopheles Mosquitoes in Western Kenya

Joseph W. WekesaDepartment of Zoology, University of Nairobi, Kenya Medical Research Institute and U.S. Army Medical Research Unit, Nairobi, Kenya

Search for other papers by Joseph W. Wekesa in
Current site
Google Scholar
PubMed
Close
,
Robert S. CopelandDepartment of Zoology, University of Nairobi, Kenya Medical Research Institute and U.S. Army Medical Research Unit, Nairobi, Kenya

Search for other papers by Robert S. Copeland in
Current site
Google Scholar
PubMed
Close
, and
Richard W. MwangiDepartment of Zoology, University of Nairobi, Kenya Medical Research Institute and U.S. Army Medical Research Unit, Nairobi, Kenya

Search for other papers by Richard W. Mwangi in
Current site
Google Scholar
PubMed
Close
Restricted access

Feeding behavior was compared between infected and uninfected field-collected groups of Anopheles gambiae sensu lato and An. funestus from western Kenya. A significantly greater percentage (81%) of Plasmodium falciparum-infected An. gambiae s.l. females probed on experimental hosts (hamsters) than did uninfected females (38%). Among those females that initiated probing, there was no effect of infection status on the ability to take a bloodmeal. Plasmodium falciparum-infected An. gambiae s.l. probed more often (mean = 4.0) and for a longer time (mean = 277 sec) than did their uninfected counterparts (mean = 2.4 probes and mean probing time = 214 sec). Results for the small number of An. funestus that fed followed the same trend. Among infected An. gambiae s.l. females, there was no effect of sporozoite density on either the number of probes made or the total probing time. Among uninfected females, there was no difference in feeding behavior between nulliparous and parous females. In laboratory experiments, female age had no effect on blood-feeding behavior. Our findings provide evidence that natural malaria infection modifies the feeding behavior of Anopheles females.

Save