[The season of possible malaria transmission by Anopheles claviger and Anopheles messeae mosquitoes in the Chu River valley of the Kyrgyz Republic].
The study was undertaken to define the limits of a possible season of malaria transmission by the prevalent species of Anopheles mosquitoes in the Chu valley situated in the north of the republic where large inhabited areas, including its capital Bishkek, concentrated. The beginning of the malaria transmission season was considered to be associated with the actual emergence of potentially dangerous females whose physiological age at this time was equal or longer than the time required for sporogony to be completed in their bodies. The female physiological age was defined by the intraovarian oil injection method developed by Lange, Chyong Kuang Khok, Sokolova. The duration of sporogenous cycles was determined by the Oganov-Raevskiĭ method and that of gonotrophic cycles was estimated by the Shlënova method. The potentially hazardous females were calculated from the number of gonotrophic cycles which fit the cycle of sporogony in terms of time. The first potentially dangerous An. claviger females were found in Bishkek in the mid-June of 1993. Their maximum was noted in the first half of July. Potentially dangerous females disappeared in the second ten days of September. The similar studies were made for An. messeae on the foothills of the Chu valley where the highest size of the mosquitoes of this species was observed. Potentially dangerous An. messeae females were found from the third ten days of June to the second ten days of September. The findings suggest that the classical role of An. messeae retains in the possible transmission of malaria in the Chu valley of the Kirghiz Republic. However, An. claviger has gained no less importance. These prevalent species can transmit Plasmodium vivax on the territory under study during 2.5 months from late June to mid-September.
Bublikova
L I
LI
Tamarina
N A
NA
D000818:Animals; D000852:Anopheles / Q000254:growth & development; D004197:Disease Reservoirs; D017753:Ecosystem; D005260:Female; D005618:Fresh Water; D006801:Humans; D007303:Insect Vectors / Q000254:growth & development; D007707:Kyrgyzstan; D008288:Malaria / Q000635:transmission*; D012621:Seasons