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Covid may prolong infection in children, adults with cancer

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New York, April 29, 2021-
Children and young adults with compromised immune systems, such as those undergoing cancer treatment, may experience a prolonged period of infection with SARS-CoV-2, the virus that causes Covid-19, finds a study.

The extended duration of infection may also increase the incidence of mutations, said researchers at the Children’s Hospital Los Angeles (CHLA), US.

In the study, published in the journal EBioMedicine, the team described two children and a young adult with acute lymphoblastic leukemia who tested positive for SARS-CoV-2 for months. Lymphoblastic leukemia is a type of cancer of the blood and bone marrow that affects white blood cells.

While most people are infectious for about 10 days after first showing Covid symptoms, this is the first report of active prolonged symptoms and infection in a pediatric or young adult population, said lead author Jennifer Dien Bard, Director of the Clinical Microbiology and Virology Laboratory at CHLA.

SARS-CoV-2 mutates about once or twice a month, according to Bard. A long period of infection raises concerns about the development of viral mutations. When a virus replicates, it copies its genetic code, but sometimes the virus makes a mistake known as a mutation.

Most mutations have no effect on how the virus behaves or on the disease it causes, but some may result in the virus acting differently. For example, the B117 SARS-CoV-2 variant, which has 17 mutations, is thought to be more infectious than other virus variants.

There is some evidence to suggest the B117 variant may have originated in a person who was immunocompromised and consistently infected with SARS-CoV-2. Yet even in immunocompromised patients, months-long infections are rare, Bard said.

“We have had many other immunocompromised patients who have not experienced these prolonged infections, but it’s something to be aware of, and hospitals may want to consider changing infection control policies to address this particular special population,” Bard said. (Agency)

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