Mutated cold virus can be lethal

ATLANTA — A mutated version of a common cold virus has caused 10 deaths in the past 18 months, U.S. health officials said Thursday.

Adenoviruses usually cause respiratory infections that aren't considered lethal. But a new variant has caused at least 140 illnesses in New York, Oregon, Washington and Texas, according to a report issued Thursday by the U.S. Centers for Disease Control and Prevention.

CDC officials don't consider the mutation to be a cause for alarm for most people, and they're not recommending any new precautions for the general public.

"It's an uncommon infection," said Dr. Larry Anderson, a CDC epidemiologist.

The illness made headlines in Texas earlier this year, when a so-called boot camp flu sickened hundreds at Lackland Air Force Base in San Antonio. The most serious cases were blamed on the emerging virus, and one 19-year-old trainee died.

"What really got people's attention is these are healthy young adults landing in the hospital and, in some cases, the ICU," said Dr. John Su, an infectious diseases investigator with the CDC.

There are more than 50 distinct types of adenoviruses tied to human illnesses. They are one cause of the common cold and also trigger pneumonia and bronchitis. Severe illnesses are more likely in people with weaker immune systems.

Some adenoviruses have also been blamed for gastroenteritis, conjunctivitis and cystitis.

There are no good antiviral medications for adenoviruses. Patients usually are treated with aspirin, liquids and bed rest.

Some people who get infected by the new bug probably would not suffer symptoms, and some may just feel common cold symptoms. Sick people should see a doctor if they suffer a high fever or have trouble breathing, Anderson said.

In the CDC report, the earliest case of the mutated virus was found in an infant girl in New York City, who died last year. The child seemed healthy right after birth but then became dehydrated and lost appetite. She died 12 days after she was born.

Tests found that she been infected with a form of adenovirus, called Ad14, but with some little differences, Su said.

It's not clear how the changes made it more lethal, said Linda Gooding, an Emory University researcher who specializes in adenoviruses.