Mosquitoes (Diptera: Culicidae), in contrast to ticks (Acari: Ixodidae), do not carry Francisella tularensis in a natural focus of tularemia in the Czech Republic.
In total, 9167 mosquitoes (Aedes spp.: A. cantans, A. cinereus, A. sticticus, A. vexans) and 1987 ixodid ticks (1423 Dermacentor reticulatus, 504 Ixodes ricinus and 60 Haemaphysalis concinna), collected in 1995-96, were examined in an active enzootic focus (floodplain forest-meadow ecosystem) of tularaemia in Břeclav district, South Moravia, Czech Republic. Although no F. tularensis was detected in mosquitoes or H. concinna, 30 isolates were recovered from D. reticulatus (infection rate, 2.1%) and 1 isolate from I. ricinus (infection rate, 0.2%). It was concluded that ixodid ticks, especially D. reticulatus, but not mosquitoes, serve as vectors (and perhaps reservoirs) of F. tularensis at this natural focus.