BORRELIAE IN AEDES-VEXANS AND HIBERNATING CULEX-PIPIENS-MOLESTUS MOSQUITOS

Four hundred and eighty and 400 females of Culex pipiens molestus mosq uitoes collected at the beginning and the end of the hibernation perio d 1990/91, respectively, and 140 female mosquitoes of the genus Aedes (mostly Ae. vexans) collected during August and September 1990 in sout hern Moravia (CSFR) were examined by dark field microscopy for the pre sence of borreliae. Borreliae were detected in 4.1% of Aedes vexans. C ulex pipiens molestus mosquitoes harboured borreliae in 4.3% in autumn and 3.5% in the next spring.