Malaria is concentrated in tropical and subtropical regions, mainly across Africa, Southeast Asia, and parts of South America

Malaria does not spread evenly across the world. The disease clusters in warm climates near the equator, where the mosquitoes that carry it thrive year-round. About 95% of malaria deaths occur in Africa, with the vast majority in sub-Saharan Africa. But the disease also takes hold in countries across Southeast Asia, the Pacific, and Central and South America. If you live in or travel to these regions, your risk is significantly higher than in temperate zones.

The mosquito that spreads malaria—the Anopheles mosquito—needs warm, wet conditions to breed and survive. It cannot survive in cold climates, which is why malaria has never been endemic (naturally occurring) in Canada, northern Europe, or most of the United States. Even within tropical countries, malaria is not everywhere: it concentrates in specific regions where rainfall, temperature, and altitude create the right conditions for both the mosquito and the parasite it carries.

Key Takeaways

  • Sub-Saharan Africa accounts for the majority of malaria cases and deaths worldwide, with Nigeria, the Democratic Republic of Congo, and Uganda among the hardest hit.
  • Malaria also spreads in parts of Southeast Asia, the Pacific Islands, and Central and South America, though transmission rates vary widely by country and season.
  • The disease concentrates in warm, wet regions where Anopheles mosquitoes can breed year-round or during rainy seasons.
  • Altitude, rainfall patterns, and local mosquito populations determine whether malaria is common in a specific area, even within the same country.
  • Travelers to malaria-endemic regions should take preventive steps before departure, as the disease does not occur naturally in North America, Europe, or Australia.

Why Africa carries the heaviest burden

Africa south of the Sahara Desert is where malaria causes the most illness and death. The region has the right climate for Anopheles mosquitoes to breed continuously, and many areas lack the infrastructure to diagnose and treat the disease quickly. Children under five and pregnant women face the highest risk of severe malaria in Africa.

Nigeria alone accounts for roughly one-quarter of all malaria cases in Africa. The Democratic Republic of Congo, Uganda, Mozambique, and Cameroon also report very high numbers. In these countries, malaria is not a rare disease—it is a constant public health challenge that affects millions of people every year. Even in areas with strong health systems, the sheer volume of cases makes prevention and treatment difficult.

Malaria hotspots in Asia and the Pacific

Southeast Asia is the second major region where malaria spreads. Countries including Indonesia, the Philippines, Thailand, and Myanmar report significant transmission, particularly in rural and forested areas. The disease is less common in cities and in areas with strong mosquito control programs, but it remains a concern in many communities.

Papua New Guinea and the Solomon Islands in the Pacific also have high malaria transmission. In these island nations, the warm, humid climate and limited access to healthcare in remote areas make the disease harder to control. Parts of India, particularly in central and northeastern regions, also see regular malaria cases, though transmission has declined in recent decades.

Central and South America's malaria zones

Malaria exists in parts of Central America and the Amazon basin in South America, though it is far less common than in Africa or Asia. Brazil, Peru, and Colombia report the most cases in the region. The disease concentrates in forested areas and along rivers, where Anopheles mosquitoes breed in natural water sources.

In Central America, countries including Honduras, Guatemala, and Nicaragua have malaria transmission, mainly in rural lowland areas. However, many popular tourist destinations in the region—including most of Mexico's resort areas—have little to no malaria risk. The disease is not present in the southern cone of South America (Argentina, Chile, Uruguay) or in most urban centers across the continent.

How geography and climate shape where malaria spreads

Malaria does not occur randomly. Three factors determine whether the disease will spread in a given area: temperature, rainfall, and the presence of Anopheles mosquitoes. The parasite that causes malaria cannot develop inside the mosquito if temperatures stay below 18°C (64°F) for extended periods. This is why malaria does not naturally occur in temperate climates.

Rainfall creates breeding grounds for mosquitoes. Areas with seasonal rains may see malaria transmission spike during and after the wet season, then decline when conditions dry out. High altitude also protects against malaria—the disease is rare above 2,000 meters (6,500 feet) because temperatures are too cool for the parasite to develop. Some highland areas in East Africa and South America sit at the edge of malaria zones, where transmission happens only during warm, wet months.

Malaria risk for travelers from non-endemic countries

If you live in North America, Europe, or Australia and travel to a malaria-endemic region, you have no natural immunity. Your risk depends on which country you visit, which specific areas you go to, and what time of year you travel. A trip to a major city in a malaria-endemic country carries lower risk than a trip to a rural or forested area.

Before traveling to Africa, Asia, or Central or South America, check with your doctor or a travel clinic about malaria prevention. They can tell you whether the specific regions you plan to visit have malaria transmission and what preventive steps make sense for you. Some travelers take antimalarial medication; others use insect repellent and bed nets. The right approach depends on your destination and the current transmission patterns there.

Countries and regions with little or no malaria

Large parts of the world have no malaria transmission. All of North America, Europe, Australia, New Zealand, and most of the Middle East are malaria-free. In Asia, Japan, South Korea, and most of China have eliminated malaria or have such low transmission that the disease is not a public health concern. Southern Africa—including South Africa, Botswana, and Namibia—has lower transmission than central and West Africa, though some risk remains in certain areas and seasons.

Even within malaria-endemic countries, many regions are malaria-free. Nairobi, Kenya; Bangkok, Thailand; and Lima, Peru are major cities where malaria transmission is minimal or absent. Altitude, urban development, and mosquito control efforts all reduce risk in these places. If you are traveling to a malaria-endemic country, ask your doctor specifically about the areas you plan to visit rather than assuming the entire country is high-risk.

Frequently Asked Questions

Can I get malaria if I travel to a malaria-endemic country for just a few days?

Yes, malaria can develop after just one mosquito bite, though symptoms typically appear 7 to 30 days after infection. If you travel to a malaria area, even briefly, take preventive steps before you go. Tell your doctor your travel dates and destinations so they can recommend the right prevention strategy for your trip.

Is malaria common in tourist resorts in malaria-endemic countries?

Many popular tourist destinations in malaria-endemic regions have low or no transmission because they are in cities, at high altitude, or in areas with strong mosquito control. However, some resorts in forested or rural areas do have malaria risk. Ask your hotel or travel provider about malaria risk at your specific destination, and check with a travel clinic before you go.

Why hasn't malaria been eliminated from Africa like it has been in other parts of the world?

Malaria elimination requires sustained funding for mosquito control, rapid diagnosis and treatment, and strong health systems—resources that are limited in many African countries. The disease also spreads faster in areas with high population density and limited access to healthcare. International efforts are underway, but elimination remains a long-term goal rather than an immediate reality.

If I was born in a malaria-endemic country but now live elsewhere, am I still at risk when I visit?

People who grew up in malaria-endemic areas develop some immunity over time, which reduces their risk of severe disease. However, immunity fades if you leave the area for several years. If you are returning to visit family, talk to your doctor about whether preventive medication makes sense for you, as your immunity may not be as strong as it once was.

What is the difference between malaria risk in the rainy season versus the dry season?

In many malaria-endemic regions, transmission peaks during and just after the rainy season, when mosquitoes have abundant breeding grounds. During the dry season, transmission often drops sharply. If you are planning travel to a seasonal malaria area, timing your trip during the dry season can lower your risk, though you should still take preventive steps.