The beaches of Brazil beckon — but travelers need to find out if they're heading to a part of the country where a yellow fever vaccine is recommended.
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A mosquito's antenna responds to odors. Scientists are trying to figure out how the malaria parasite might trigger a change in body odor that draws in mosquitoes that carry the disease, like the Anopheles skeeter pictured above.
Monsoon rains flooded Mumbai in August 2017. Aedes aegypti mosquitoes can spread diseases like dengue fever. Drought has affected the health of Somalians.
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A worker fogs a neighborhood on the outskirts of Colombo in Sri Lanka in an effort to ward off mosquitoes. The country is facing an outbreak of dengue fever, a mosquito-borne disease.
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These are insect cells infected with the Guaico Culex virus. The different colors denote cells infected with different pieces of the virus. Only the brown-colored cells are infectious, because they contain the complete virus.
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Surgeon General Vivek Murthy looks at a sample of mosquitoes in Orlando, Fla., on Monday. With him is Department of Health and Human Services Secretary Sylvia Burwell and Orange County Mayor Teresa Jacobs.