Mozzwise tracks 9 mosquito-borne diseases that matter for travelers. Each profile covers symptoms, where it occurs, the species that carry it, and what public health agencies recommend for prevention. Severity reflects clinical risk and traveler exposure, not just lethality.
Dengue is the most common mosquito-borne viral disease worldwide, with an estimated 100-400 million infections per year. It is transmitted by Aedes aegypti and Aedes albopictus mosquitoes, both aggressive day-biters most active in early morning and late afternoon.
Malaria is the deadliest mosquito-borne disease globally, killing approximately 600,000 people per year — predominantly young children in Sub-Saharan Africa. It is caused by Plasmodium parasites transmitted through the bite of infected Anopheles mosquitoes, which feed primarily at night.
Yellow fever is one of the most dangerous mosquito-borne diseases — severe cases have a 20-50% fatality rate. The good news: it is also one of the most preventable. A single vaccine dose provides lifetime protection, and many countries require proof of vaccination for entry.
Most Zika infections are mild or completely asymptomatic — roughly 80% of people never know they were infected. However, Zika poses a serious risk during pregnancy: the virus can cross the placental barrier and cause microcephaly and other severe birth defects.
Chikungunya rarely kills, but it can be profoundly debilitating. The hallmark symptom is severe joint pain that can persist for weeks, months, or even years after the initial infection. The name itself comes from a Makonde word meaning "to become contorted" — describing the stooped posture of sufferers.
Japanese encephalitis is rare in travelers but potentially devastating — about 30% of symptomatic cases are fatal, and up to 50% of survivors have permanent neurological damage. The vast majority of infections (99%) are asymptomatic or cause only mild illness.
Lymphatic filariasis is a parasitic infection that can cause dramatic swelling of the limbs and skin (elephantiasis) in advanced cases. However, it requires months of repeated mosquito bites to establish — making it extremely unlikely in short-term travelers.
West Nile virus is extremely common but rarely causes serious illness — about 80% of infections produce no symptoms at all, and most symptomatic cases resemble a mild flu. However, roughly 1 in 150 infections leads to neuroinvasive disease (encephalitis or meningitis), which can be severe or fatal.
St. Louis encephalitis is a rare mosquito-borne virus found only in the Americas. Most infections produce no symptoms at all, and symptomatic cases are uncommon. Severe encephalitis occurs primarily in elderly adults.