Monsoon rains flooded Mumbai in August 2017. Aedes aegypti mosquitoes can spread diseases like dengue fever. Drought has affected the health of Somalians.
(From left) Punit Paranjpe/AFP/Getty Images; Christophe Simon/AFP/Getty Images; Arif Hudaverdi Yaman/Anadolu Agency/Getty Images
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.
Ishara S. Kodikara/AFP/Getty Images
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.
Michael Lindquist/Cell Press