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CDC says adenovirus may have caused Alabama outbreak of severe hepatitis in children – CNBC

April 29, 2022
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Adenovirus structure, computer illustration showing the surface structure of the virus’ outer protein coat (capsid).

Kateryna Kon | Science Photo Library | Science Photo Library | Getty Images

U.S. health officials said adenovirus may have caused an outbreak of severe hepatitis that afflicted nine children in Alabama in February.

All nine kids with severe acute hepatitis, three of whom suffered liver failure, tested positive for adenovirus and none of them had a history Covid-19 infection, according to the Centers for Disease Control and Prevention.

“At this time, we believe adenovirus may be the cause for these reported cases, but other potential environmental and situational factors are still being investigated,” the CDC said in a statement. “Adenovirus type 41 is not usually known as a cause of hepatitis in otherwise healthy children, and no known epidemiological link or common exposures among these children has been found.”

The CDC on Friday published its most detailed findings so far about the children, after issuing a nationwide health alert last week. It said adenovirus infection may be an underrecognized contributor to liver injury in otherwise healthy children but further investigation is needed.

While hepatitis is not uncommon in children, the cluster of cases in Alabama surprised physicians because the previously healthy kids had severe symptoms and did not test positive for hepatitis viruses.

Public health authorities in the U.S. and Europe are closely tracking cases of severe hepatitis in kids after the U.K alerted the World Health Organization earlier this month about a cluster of cases there. The WHO has identified 169 cases worldwide so far, with the overwhelming majority of them in the U.K.

All nine children in the U.S. were patients at the hospital Children’s of Alabama, who ranged in age from about 2 to 6 years old, according to the CDC. Three of the patients suffered liver failure and two needed liver transplants. All of them have either recovered or are recovering.

The children’s symptoms before hospital admission included vomiting, diarrhea and upper respiratory symptoms. Eight of the patients had scleral icterus, a yellowing of the white of the eye. Seven had enlarged livers, six had jaundice and one had encephalopathy, a broad term for disease of the brain.

All of the children tested positive for adenovirus, a common infection that can cause respiratory illnesses, an upset stomach, pink eye and bladder inflammation or neurological disease in rarer cases. Adenovirus is a known cause of hepatitis in children with weak immune systems, but the patients in Alabama all had normal immune systems and no significant health conditions, according to the CDC.

Although six of the kids also tested positive for Epstein-Barr virus, the CDC does not believe these were acute infections because they tested negative for antibodies. The children all tested negative for hepatitis viruses A, B and C, according to the CDC. None of them had a history of Covid-19 infection.

Doctors in Alabama identified the first five cases last fall. The CDC and the Alabama Department of Public Health began an investigation in November. They identified four more cases in Alabama through February of this year. No additional cases have been identified in Alabama since February.

The CDC said it’s monitoring the situation closely to better understand the cause of severe hepatitis in the kids and to find ways to prevent the illness. The public health agency told physicians to be aware that whole blood tests, rather than plasma, might be better at detecting the presence of adenovirus.

CNBC Health & Science

Read CNBC’s latest global coverage of the Covid pandemic:

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