Click a letter to see a list of conditions beginning with that letter.
Click 'Topic Index' to return to the index for the current topic.
Click 'Library Index' to return to the listing of all topics.
What is malaria?
A parasite causes malaria. A bite
from an infected mosquito passes the parasite to humans. These mosquitoes are found in
the tropics and subtropics in almost all countries. Nearly all cases of malaria in the
U.S. occur in people who have traveled to other countries. Treatment removes the
parasite from the blood.
After the parasites get into the
body by a mosquito bite, they gather in the liver. After several days, infected red
blood cells (RBCs) emerge from the liver. These cells infect other RBCs.
What causes malaria?
If you are bitten by a
Plasmodium-infected Anopheles mosquito, you can get malaria. Several different species
of Plasmodium can infect mosquitoes. Some species cause more serious problems than
others do. One species in particular can be life threatening. It may cause liver and
kidney failure. Another can stay dormant in the liver for many months or years.
Who is at risk for malaria?
The risk of getting malaria depends on:
What are the symptoms of malaria?
Early stages of malaria may be like
the flu. These are the most common symptoms of malaria:
Symptoms of malaria often start
from 7 to 30 days after the mosquito bite. But malaria can develop as early as 6 to 8
days after being bitten by an infected mosquito. Or it can develop as late as several
months or rarely years after leaving a place where there is malaria.
Always talk with your healthcare provider for a diagnosis.
How is malaria diagnosed?
Your healthcare provider will ask
about your past health and do a physical exam. You may also have blood tests to rule out
other possible infections. Using a microscope and other types of testing, your
healthcare provider can confirm if you have malaria parasites in your blood.
How is malaria treated?
Treatment will depend on your symptoms, age, and general health. It will also depend on
how severe the condition is.
Treatment in the early stages works best. Delaying treatment can lead
to serious problems. Treatment for malaria will vary depending on which species of
Plasmodium you were infected with.
Treatment may include:
What are possible complications of malaria?
Complications of malaria are more
common with falciparum malaria. It is the most potentially life threatening type of the
disease. People with a severe case of this type may have:
Liver and kidney failure
Can malaria be prevented?
You can prevent malaria by using
antimalarial medicines when you may be exposed to the disease. Also take measures
against mosquito bites. These include using mosquito nets when sleeping at night and
insect repellent during the day.
When planning to travel to a
place where malaria occurs, talk with your healthcare provider well in advance of
your trip. He or she can give you medicine to prevent malaria. But travelers
to different countries may have different recommendations. Travelers visiting cities
or rural areas where there is no risk of malaria may not need preventive medicines.
Give your healthcare provider an exact list of the places you will be. Your
healthcare provider can then decide what treatment you need.
Several medicines can prevent
malaria in travelers. Deciding which medicine is best depends on several factors.
For treatment to work, you must take the medicine exactly as prescribed. You
must start these medicines before you arrive at your destination. And you must
continue them for a certain number of days or weeks after your return. The time
period depends on which medicine is prescribed.
Protection from mosquitoes
You are still at risk for
malaria even wehn using protection.
To prevent mosquito bites, the
CDC recommends you:
Use insect repellent on exposed
skin. Choose repellent that has 20% to 35% N,N-Diethyl-meta-toluamide (DEET).
Wear long-sleeved clothing and long pants if you are outdoors at night.
Use a mosquito net over the bed if
your bedroom is not air-conditioned or screened. For more protection, treat the
mosquito net with the insecticide permethrin.
Spray an insecticide or repellent
on clothing. Mosquitoes may bite through thin clothing.
Spray pyrethrin or a similar insecticide in your bedroom before going to bed.
Vitamin B and ultrasound devices
don't prevent mosquito bites. You can find important, current information about
prevention and precautions at www.cdc.gov/malaria.
When should I call my healthcare provider?
If you become ill with a fever
during or after travel in a malaria risk area, get medical care right away. Tell your
healthcare providers of your recent travel. Don’t assume you have the flu or some other
disease without having a lab test to find out if the symptoms are caused by malaria.
Key points about malaria
Malaria is a disease caused by a
parasite. A bite from an infected mosquito passes the parasite to humans.
Nearly all cases of malaria in the
U.S. are in people who have traveled to other countries.
Early symptoms of malaria may be like
If you become ill with a fever during
or after travel in a malaria risk area, get medical care right away. Tell your
healthcare providers of your recent travel history.
Tips to help you get the most from a visit to your healthcare provider:
Know the reason for your visit and what you want to happen.
Before your visit, write down questions you want answered.
Bring someone with you to help you ask questions and remember what your provider tells you.
At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you.
Know why a new medicine or treatment is prescribed, and how it will help you. Also know what the side effects are.
Ask if your condition can be treated in other ways.
Know why a test or procedure is recommended and what the results could mean.
Know what to expect if you do not take the medicine or have the test or procedure.
If you have a follow-up appointment, write down the date, time, and purpose for that visit.
Know how you can contact your provider if you have questions.
Online Medical Reviewer:
Barry Zingman MD
Online Medical Reviewer:
L Renee Watson MSN RN
Online Medical Reviewer:
Marianne Fraser MSN RN
Date Last Reviewed:
© 2000-2018 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.