Culex quinquefasciatus
Culex quinquefasciatus is the southern counterpart to Cx. pipiens — the dominant house mosquito of tropical and subtropical urban areas worldwide. It transmits West Nile virus, St. Louis encephalitis, and lymphatic filariasis, and thrives in the polluted water that accumulates in poorly drained urban environments.
It is a persistent night-biter, active from dusk to dawn, readily entering houses and following humans indoors. Unlike the temperate Cx. pipiens, it is adapted to year-round activity in warm climates, sustaining transmission continuously rather than in summer peaks.
It is closely associated with poor sanitation infrastructure — open drains, cesspools, septic tanks, and wastewater channels are its preferred breeding sites. This makes urban West Nile and filariasis transmission an urban-planning problem as much as a public-health one.
Biting behaviour
Dusk-to-dawn biter, indoors and outdoors, year-round in tropical climates. Human-biting preference but will feed on birds and other mammals.
Habitat
Polluted water bodies associated with poor sanitation — open drains, cesspools, septic tanks, wastewater channels, storm drains.
Diseases transmitted
How to identify
Where found
Tropical and subtropical regions worldwide — southern US, Caribbean, Central and South America, Sub-Saharan Africa, South and Southeast Asia, Pacific Islands, northern Australia.
Precautions
Recommended Protection
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Countries where Culex quinquefasciatus is relevant
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Vector information is sourced from WHO, CDC, and ECDC. Not medical advice. Personal decisions on repellents, vaccinations, or medication belong with a qualified travel health professional.