Malaria
Malaria is a potentially life-threatening disease caused by Plasmodium parasites that spread to people through bites from infected Anopheles mosquitoes.
What malaria is
Malaria is an infection caused by Plasmodium parasites. The parasites enter the body through the bite of an infected Anopheles mosquito, first infect the liver, and then move into red blood cells. The disease can be mild at first, but it can become severe quickly, especially with P. falciparum infection.
How mosquitoes spread it
Malaria transmission depends on the parasite, the mosquito, people, and local conditions. A mosquito becomes infected after biting someone with malaria parasites in the blood. Later, it can pass parasites to another person. Temperature, rainfall, housing, mosquito habitat, travel, and control programs all shape local risk.
Symptoms
Symptoms can include fever, chills, headache, sweats, fatigue, muscle aches, nausea, vomiting, diarrhea, and cough. Symptoms are not specific, so malaria can be mistaken for many other infections. Anyone with fever after travel to a malaria area should seek medical care promptly and mention travel history.
Severe malaria
Severe malaria can cause confusion, seizures, coma, severe anemia, breathing problems, kidney injury, low blood sugar, shock, jaundice, or high parasite levels in the blood. Children, pregnant people, travelers without partial immunity, and people with weakened immunity are at higher risk of dangerous outcomes.
Diagnosis
Malaria diagnosis should be confirmed with laboratory testing. Blood smears can identify parasites and sometimes the species and parasite burden. Rapid diagnostic tests can help in many settings. Because malaria can progress rapidly, suspected cases need urgent evaluation rather than watchful waiting.
Treatment
Malaria is treated with antimalarial medicines chosen according to the Plasmodium species, where infection likely occurred, drug-resistance patterns, pregnancy status, age, severity, and prior medicines. Severe malaria is a medical emergency and often requires intravenous treatment and close monitoring.
Prevention
Prevention works best in layers: sleeping under insecticide-treated nets, indoor residual spraying, reducing mosquito breeding sites, using repellents and protective clothing, taking chemoprevention when recommended, and diagnosing and treating infections quickly. Travelers need destination-specific advice because drug resistance and mosquito patterns vary.
Vaccines and control programs
Malaria vaccines are now recommended for children in some areas with moderate to high transmission, alongside nets, diagnosis, treatment, and chemoprevention. Vaccines do not replace other tools; they add another layer to public-health programs that must adapt to local parasites, mosquitoes, health systems, and funding.
Why it matters
Malaria matters because it links biology to environment and infrastructure. A parasite, a mosquito, a rainy season, a bed net, a clinic, and a medicine supply chain can all decide whether a fever becomes a fatal illness or a treatable one.