Japanese scientists are sounding the alarm.

The reason for this is a particularly dangerous mutation of mosquitoes that carries a whole bunch of diseases. Researchers studied mosquito samples across Asia and found that 78% had a rare mutation that makes them resistant to most chemicals. They carry yellow fever, Zika virus, dengue fever and other serious illnesses inside them. If nothing is done, mosquitoes will continue to spread, posing a threat to the entire planet.