Published on Jun 30, 2023 | 2:48 PM
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Malaria is a serious and potentially life-threatening infectious disease caused by parasites transmitted through the bite of infected mosquitoes. While malaria is rare in the United States, it remains a significant global health concern and poses a real risk to travelers visiting endemic regions.
Understanding how malaria spreads, how to recognize early symptoms, and how to prevent infection is essential—especially for those planning international travel.
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.
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.
updated 1/21/2026 Shelly House, FNP, is a Family Nurse Practitioner and Call-On-Doc’s trusted medical education voice. With extensive experience in telehealth and patient-centered care, Ms. House is dedicated to making complex health topics simple and accessible. Through evidence-based content, provider collaboration, and a passion for empowering patients, her mission is to break down barriers to healthcare by delivering clear, compassionate, and practical medical guidance.
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You're already exhausted.
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That means an everyday bump that wouldn't have left a mark years ago may now cause blood to leak underneath the skin and create a noticeable bruise.
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More fragile blood vessels
Years of sun exposure
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Corticosteroids
Certain supplements
Nutritional deficiencies
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Naturally, you think:
“I must have a UTI.”
But then your urine test comes back negative.
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