Daijiworld Media Network - Washington

Washington, Aug 29: Health officials are investigating the source of a rare and almost always fatal infection caused by a "brain-eating amoeba" after a teenager in the United States contracted the illness.

Officials have not released further details about the teenager or the circumstances surrounding the infection, citing the family's privacy.

The amoeba, Naegleria fowleri, is commonly found in warm freshwater bodies such as ponds, lakes and rivers. It is not found in saltwater or properly chlorinated swimming pools.

The infection occurs when contaminated water enters the nose, allowing the amoeba to travel to the brain. This can happen when a person jumps or dives into warm freshwater containing the organism.

The infection does not cause illness when contaminated water is swallowed.

Health officials said the disease is extremely rare but has a very high fatality rate. Fewer than 10 cases are typically reported in the United States each year.

Officials have advised people taking part in activities in warm freshwater to take precautions to reduce the risk of infection.

People should prevent water from entering the nose by keeping their heads above water, holding their noses shut or using nose clips while swimming or participating in other freshwater activities.

They have also been advised to avoid putting their heads underwater in hot springs and thermal waters.

People should avoid jumping or diving into warm freshwater when water temperatures are high and water levels are low, conditions that can increase the risk of exposure.

Officials have further advised against digging in or stirring up sediment while engaging in water activities in shallow, warm freshwater, as the amoeba can be present in sediment.

Health authorities stressed that while the infection is extremely rare, taking simple precautions can help reduce the risk when participating in activities in warm freshwater.