Unexplained hepatitis is not more common in U.S. children than before the pandemic, a C.D.C. study suggests.

According to a new review of three large medical databases by researchers at the Centers for Disease Control and Prevention, unexplained hepatitis doesn't seem to have become more common among American children than it was before the Covid-19 epidemic began.

The results are part of an ongoing investigation into a cluster of cases of severe hepatitis in previously healthy children. There were 650 probable cases reported by the World Health Organization as of May 26. The cases are very rare and can lead to death or a transplant.

Certain medications, toxins, and the hepatitis A through E Viruses are some of the causes of the disease. Many of the common causes have been ruled out.

Researchers are looking into the possibility that the cases might be linked to the Pandemic or caused by an adenoviruses, a family of common viruses that cause cold- and flu-like symptoms and have been found in many of the affected. It is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556 is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556 Children are more vulnerable to adenoviruses infections after a previous coronaviruses infections.

The officials are trying to determine if the cases represent a new phenomenon or if they are simply a new recognition of a case that has been around for a long time.

In the new study, the researchers found that the number of weekly emergency room visits and monthly hospital admissions that were recorded as being associated with the disease was not significantly higher than the baseline. The study found that the number of transplants didn't change much.

The scientists looked at data from the company Labcorp, which tests stool samples for adenoviruses type 40 and 41, which can cause gastrointestinal symptoms. The scientists found that the share of samples testing positive had not changed much in recent months.

There have been reports in Britain of an increase in adenoviruses and an increase in unexplained hepatitis in young children.

The researchers caution that it would be hard to detect a small increase in the number of children with the disease. They write that ongoing assessment of trends and enhanced epidemiologic investigations will help contextualize reported cases of acute hepatitis of unknown etiology in U.S. children.

There are a number of limitations to the new study. There is a lack of a database of unexplained children's cases in the US. When hospital admissions and transplants occur, there are lags between when these outcomes are reported and when the analysis is done.