Travelers and locals in tropical and subtropical areas know the dangers of malaria. One parasite makes the mosquito-borne disease one of the world’s most dangerous diseases.
The CDC estimated about 216 million cases of malaria around the world in 2016. Of those cases, 445,000 resulted in death.
In the United States alone there are close to 2,000 cases a year, despite no local transmission. Travelers and immigrants return from countries with malaria, unknowingly spreading the disease.