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How do mosquitoes contribute to the life cycle of Wuchereria bancrofti?
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parasitic disease
Trypanosoma brucei in a blood smear (Giemsa-stained light photomicrograph).
Mosquitoes serve as an essential intermediate host for Wuchereria bancrofti, as humans and mosquitoes are the only hosts in which the parasite can complete its life cycle.1
The mosquito's contribution to the cycle occurs in the following stages:
- Ingestion: When a mosquito bites an infected human, it draws in microfilariaeâthe elongated embryos produced by adult wormsâfrom the host's peripheral blood.21
- Development: Once inside the mosquito, these microfilariae undergo development, transforming into motile, infective larvae.2
- Transmission: During a subsequent blood meal, the mosquito introduces these infective larvae into a new human host. Once inside the human, the larvae migrate to the lymph system, where they mature into adults over 6 to 12 months to continue the cycle.21
This transmission process is a primary factor in the spread of Bancroftian filariasis, often involving mosquito species such as Culex quinquefasciatus.2