ZIKA virus causes serious birth defects with children being born with abnormally small heads. Cases of ZIKA have been consistently reported as far north as Florida.
Malaria is a parasite that infects millions people a year across the tropics. It is estimated that malaria kills one child every 40 seconds and nearly 1 million people a year.
There are not yet any vaccines to prevent dengue so avoding bites is all you can do. Serious cases cause dangerously low blood pressure to occur that can result in death.
Yellow fever has existed for at least 400 years. There is currently a growing outbreak in Brazil which has infected thousands. Symptoms include fever and loss of appetite.