Malaria is caused by Plasmodium parasites, which are transmitted to humans through the bite of an infected Anopheles mosquito. Once inside the body, the parasite travels to the liver and then infects red blood cells, where it multiplies and causes illness.

There are several species of Plasmodium that infect humans, with Plasmodium falciparum being the most severe and potentially fatal if not treated promptly.

Malaria is not spread person-to-person through casual contact. Transmission occurs primarily through mosquito bites and, in rare cases, through blood transfusion, organ transplantation, or from mother to baby during pregnancy.

Malaria is most commonly found in:

• Sub-Saharan Africa

• South and Southeast Asia

• Central and South America

• Parts of the Caribbean

• The Middle East

• Oceania

Travelers visiting these regions should be aware of malaria risk and take appropriate preventive measures.

Malaria transmission occurs when:

• An infected mosquito bites a person

• The parasite enters the bloodstream

• The parasite multiplies in the liver and red blood cells

Mosquitoes that spread malaria typically bite between dusk and dawn, making nighttime protection especially important.

Symptoms of malaria usually develop 7 to 30 days after exposure, though some cases may present months later depending on the species.

Common symptoms include:

• Fever and chills

• Sweating

• Headache

• Muscle aches

• Fatigue

• Nausea, vomiting, or diarrhea

Severe malaria symptoms may include:

• Confusion or altered mental status

• Difficulty breathing

• Severe anemia

• Jaundice (yellowing of skin or eyes)

• Organ failure

Malaria symptoms can resemble influenza or other viral illnesses, which is why travel history is critical when seeking care.

Malaria can progress rapidly, especially P. falciparum infections. Delayed treatment increases the risk of complications and death. Early diagnosis and prompt treatment significantly improve outcomes.

Anyone who develops fever after traveling to a malaria-endemic area should seek medical evaluation immediately—even if preventive medication was taken.

Malaria is diagnosed through:

• Blood tests that detect malaria parasites

• Rapid diagnostic tests (RDTs)

• Microscopic examination of blood smears

Diagnosis confirms the presence of parasites and helps determine the appropriate treatment.

Treatment depends on:

• The type of Plasmodium parasite

• Severity of illness

• Geographic location of exposure

• Medication resistance patterns

Common treatments include:

• Artemisinin-based combination therapies (ACTs)

• Chloroquine (in areas without resistance)

• Other antimalarial medications as prescribed

Severe malaria may require hospitalization and intravenous treatment.

Prevention is the most effective strategy against malaria.

Prevent Mosquito Bites

• Use EPA-approved insect repellents (such as DEET or picaridin)

• Wear long sleeves and pants

• Sleep under insecticide-treated bed nets

• Stay in air-conditioned or screened accommodations

For travelers to high-risk areas, healthcare providers may prescribe antimalarial prophylaxis. These medications must be taken before, during, and after travel to be effective.

Medication choice depends on travel destination, length of stay, medical history, and resistance patterns.

You should seek immediate medical evaluation if:

• You develop fever during or after travel to a malaria-risk area

• Symptoms appear weeks or months after travel

• You experience severe symptoms such as confusion or breathing difficulty

Malaria is a medical emergency when untreated.

Call-On-Doc provides convenient online access to licensed medical providers who can help assess malaria risk, prescribe preventive medications when appropriate, and guide next steps if symptoms develop.

Whether you’re preparing for international travel or concerned about symptoms after a trip, Call-On-Doc offers fast, reliable care without the need for in-person visits.