Not all mosquitos are able to transmit malaria and some are more adapted to transmit the disease. The most successful vectors of malaria are from the anopheles gambiae complex, with the anopheles gambiae itself begin the primary vector of malaria.
Malaria is caused by a single-cell organism called plasmodium, and some of the plasmodium strains are so adapted to anopheles mosquitos that they are able to reproduce better in the mosquito salivary glands and the plasmodium managed to escape the anopheles immune system throughout evolution.
Anopheles mosquitos that transmit malaria are supposedly eradicated in developed countries like italy, but some developing areas, mostly africa in which the anopheles gambiae is present are still suffering from malaria due to gambiae begin so potent in transmitting the disease.
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