Insects that feed on blood, like mosquitoes and fleas, are said to carry diseases because they are exposed to many different individuals’ blood. When a mosquito bites someone who has a disease, like West Nile or malaria, it can expose the next person it bites to that same disease.
Mosquitoes act as vectors for disease. They carry pathogens in their saliva and pass it from one person to the next. Mosquitoes can ingest the West Nile virus without the virus affecting them and pass it to humans. They can also carry the parasite that causes malaria and pass it to humans by feeding on their blood.
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