Information About Amebiasis
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Q. What is amebiasis?
A. Amebiasis is a disease caused by a one-celled parasite called Entamoeba histolytica (ent-a-ME-ba his-to-LI-ti-ka).
Q. Who is at risk for amebiasis?
A. Although anyone can have this disease, it is most common in people who live in developing countries that have poor sanitary conditions. In the United States, amebiasis is most often found in immigrants from developing countries. It also is found in people who have traveled to developing countries and in people who live in institutions that have poor sanitary conditions. Men who have sex with men can become infected and can get sick from the infection, but they often do not get sick.
Q. How can I become infected with E. histolytica?
A. By putting anything into your mouth that has touched the stool of a person who is infected with E. histolytica.
By swallowing something, such as water or food, that is contaminated with E. histolytica.
By touching and bringing to your mouth cysts (eggs) picked up from surfaces that are contaminated with E. histolytica.
Q. What are the symptoms of amebiasis?
A. On average, about one in 10 people who are infected with E. histolytica becomes sick from the infection. The symptoms often are quite mild and can include loose stools, stomach pain, and stomach cramping. Amebic dysentery is a severe form of amebiasis associated with stomach pain, bloody stools, and fever. Rarely, E. histolytica invades the liver and forms an abscess. Even less commonly, it spreads to other parts of the body, such as the lungs or brain.
Q. If I swallowed E. histolytica, how quickly would I become sick?
A. Usually 1 to 4 weeks later but sometimes more quickly or more slowly.
Q. What should I do if I think I have amebiasis?
A. See your health care provider.
Q. How is amebiasis diagnosed?
A. Your health care provider will ask you to submit stool samples. Because E. histolytica is not always found in every stool sample, you may be asked to submit several stool samples from several different days.
Diagnosis of amebiasis can be very difficult. One problem is that other parasites and cells can look very similar to E. histolytica when seen under a microscope. Therefore, sometimes people are told that they are infected with E. histolytica even though they are not. Entamoeba histolytica and another amoeba, Entamoeba dispar, which is about 10 times more common, look the same when seen under a microscope. Unlike infection with E. histolytica, which sometimes makes people sick, infection with E. dispar never makes people sick and therefore does not need to be treated.
If you have been told that you are infected with E. histolytica but you are feeling fine, you might be infected with E. dispar instead. Unfortunately, most laboratories do not yet have the tests that can tell whether a person is infected with E. histolytica or with E. dispar. Until these tests become more widely available, it usually is best to assume that the parasite is E. histolytica.
A blood test is also available. However, the test is recommended only when your health care provider thinks that your infection has invaded the wall of the intestines (gut) or some other organ of your body, such as the liver. One problem is that the blood test may still be positive if you had amebiasis in the past, even if you are no longer infected now.
Q. How is amebiasis treated?
A. Several antibiotics are available to treat amebiasis. Treatment must be prescribed by a physician. You will be treated with only one antibiotic if your E. histolytica infection has not made you sick. You probably will be treated with two antibiotics (first one and then the other) if your infection has made you sick.
Q. I am going to travel to a country that has poor sanitary conditions. What should I eat and drink there so I will not become infected with E. histolytica or other such germs?
A. Drink only bottled or boiled (for 1 minute) water or carbonated (bubbly) drinks in cans or bottles. Do not drink fountain drinks or any drinks with ice cubes. Another way to make water safe is by filtering it through an "absolute 1 micron or less" filter and dissolving iodine tablets in the filtered water. "Absolute 1 micron" filters can be found in camping/outdoor supply stores.
Do not eat fresh fruit or vegetables that you did not peel yourself.
Do not eat or drink milk, cheese, or dairy products that may not have been pasteurized.
Do not eat or drink anything sold by street vendors.
Q. Should I be concerned about spreading infection to the rest of my household
A. Yes. However, the risk of spreading infection is low if the infected person is treated with antibiotics and practices good personal hygiene. This includes thorough hand washing with soap and water after using the toilet and before handling food.
Source: The Center for Disease Control
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