Mosquito testis infected with bacteria. Coloured transmission electron micrograph (TEM) of a testis from a Culex pipiens mosquito infected with Walbachia sp. bacteria (green). This bacteria is being studied as a potential biological control against mosquitoes that spread diseases such as malaria and dengue fever. It shortens the lifespan of infected mosquitoes by half. This makes the mosquito's lifespan shorter than the incubation period of the pathogen, and the mosquito dies before it is able to pass the disease to a mammal host. Magnification: x22,000 when printed at 10 centimetres tall.
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