Malaria is a parasitic illness spread by mosquitoes. Humans get infected with the parasite after being bitten by infected mosquitoes. Malaria makes people feel very sick, with a high temperature and shivering chills.
Malaria is still frequent in tropical and subtropical nations, despite its rarity in temperate settings. Malaria infects over 290 million people each year, with over 400,000 people dying as a result of the disease.
World health organizations offer malaria prevention medications and insecticide-treated bed nets to keep people safe from mosquito bites. A malaria vaccine has been recommended by the World Health Organization for use in children living in malaria-prone areas.
Traveling with protective gear, bed nets, and pesticides can help you stay safe. Preventive medication can also be used before, during, and after a journey to a high-risk location. Many malaria parasites have evolved resistance to standard antimalarial medicines.
Symptoms of Malaria
Signs and symptoms of malaria may include:
- General feeling of discomfort
- Nausea and vomiting
- Abdominal pain
- Muscle or joint pain
- Rapid breathing
- Rapid heart rate
Malaria sufferers may undergo “attacks” on a regular basis. Shivering and chills are common symptoms of an attack, which are followed by a high Fever, sweating, and a return to normal temperature.
Symptoms of malaria usually appear a few weeks after being bitten by an infected mosquito. Some malaria parasites, on the other hand, can remain latent in your body for up to a year.
When to see a doctor
Talk to your doctor if you experience a Fever while living in or after traveling to a high-risk malaria region. If you have severe symptoms, seek emergency medical attention.
Malaria is caused by a single-celled parasite of the genus plasmodium. The parasite is transmitted to humans most commonly through mosquito bites.
Mosquito transmission cycle
- Uninfected mosquito. A mosquito becomes infected by feeding on a person who has malaria.
- Transmission of parasite. If this mosquito bites you in the future, it can transmit malaria parasites to you.
- In the liver. Once the parasites enter your body, they travel to your liver — where some types can lie dormant for as long as a year.
- Into the bloodstream. When the parasites mature, they leave the liver and infect your red blood cells. This is when people typically develop malaria symptoms.
- On to the next person. If an uninfected mosquito bites you at this point in the cycle, it will become infected with your malaria parasites and can spread them to the other people it bites.
Other modes of transmission
Because the parasites that cause malaria affect red blood cells, people can also catch malaria from exposure to infected blood, including:
- From mother to unborn child
- Through blood transfusions
- By sharing needles used to inject drugs
The greatest risk factor for developing malaria is to live in or to visit areas where the disease is common. These include the tropical and subtropical regions of:
- Sub-Saharan Africa
- South and Southeast Asia
- Pacific Islands
- Central America and northern South America
The degree of risk depends on local malaria control, seasonal changes in malaria rates and the precautions you take to prevent mosquito bites.
Risks of more-severe disease
People at increased risk of serious disease include:
- Young children and infants
- Older adults
- Travelers coming from areas with no malaria
- Pregnant women and their unborn children
In many countries with high malaria rates, the problem is worsened by lack of access to preventive measures, medical care and information.
Immunity can wane
Residents of a malaria region may be exposed to the disease enough to acquire a partial immunity, which can lessen the severity of malaria symptoms. However, this partial immunity can disappear if you move to a place where you’re no longer frequently exposed to the parasite.
Complications of Malaria
Malaria can be fatal, particularly when caused by the plasmodium species common in Africa. The World Health Organization estimates that about 94% of all malaria deaths occur in Africa — most commonly in children under the age of 5.
Malaria deaths are usually related to one or more serious complications, including:
- Cerebral malaria. If parasite-filled blood cells block small blood vessels to your brain (cerebral malaria), swelling of your brain or brain damage may occur. Cerebral malaria may cause seizures and coma.
- Breathing problems. Accumulated fluid in your lungs (pulmonary edema) can make it difficult to breathe.
- Organ failure. Malaria can damage the kidneys or liver or cause the spleen to rupture. Any of these conditions can be life-threatening.
- Anemia. Malaria may result in not having enough red blood cells for an adequate supply of oxygen to your body’s tissues (anemia).
- Low blood sugar. Severe forms of malaria can cause low blood sugar (hypoglycemia), as can quinine — a common medication used to combat malaria. Very low blood sugar can result in coma or death.
Malaria may recur
Some varieties of the malaria parasite, which typically cause milder forms of the disease, can persist for years and cause relapses.
If you live in or are traveling to an area where malaria is common, take steps to avoid mosquito bites. Mosquitoes are most active between dusk and dawn. To protect yourself from mosquito bites, you should:
- Cover your skin. Wear pants and long-sleeved shirts. Tuck in your shirt, and tuck pant legs into socks.
- Apply insect repellent to skin. Use an insect repellent registered with the Environmental Protection Agency on any exposed skin. These include repellents that contain DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), para-menthane-3,8-diol (PMD) or 2-undecanone. Do not use a spray directly on your face. Do not use products with OLE or PMD on children under age 3.
- Apply repellent to clothing. Sprays containing permethrin are safe to apply to clothing.
- Sleep under a net. Bed nets, particularly those treated with insecticides, such as permethrin, help prevent mosquito bites while you are sleeping.
If you’ll be traveling to a location where malaria is common, talk to your doctor a few months ahead of time about whether you should take drugs before, during and after your trip to help protect you from malaria parasites.
In general, the drugs taken to prevent malaria are the same drugs used to treat the disease. What drug you take depends on where and how long you are traveling and your own health.
The World Health Organization has recommended a malaria vaccine for use in children who live in countries with high numbers of malaria cases.
Researchers are continuing to develop and study malaria vaccines to prevent infection.