Since the beginning of the coronavirus pandemic, there have been many cases that show that it is a virus different from all. One of those is that of an infected woman who, in addition to being asymptomatic, It has been contagious for 70 days.

The case, which collects Science Alert, was registered in Montana, United States. The 71-year-old woman suffers from chronic lymphocytic leukemia. You had a coronavirus test and positive god.

She was followed up and it was concluded that the woman had been contagious for 70 days, and for 105 tested positive for coronavirus.

Apparently, the woman was immunosuppressed due to her leukemia could be the key. “Although it is difficult to extrapolate, our data suggest that the spread of the virus may be of concern in the case of immunosuppressed patients“say the researchers.

The woman first tested positive for SARS-CoV-2 on March 2, 2020 after being admitted to the hospital for severe anemia related to her cancer. Then he tested positive for Covid-19 another 13 times and showed no symptoms of the disease.

He received plasma twice from people who had recovered from Covid-19 and, finally, removed the virus from your system sometime in mid-June.

Doctors do not know exactly when she acquired the coronavirus, but it is most likely that it was in a rehabilitation center that the woman attended and that she had a large outbreak of Covid-19 in February.

From throat swabs collected during the course of her 15-week infection, the researchers showed that the woman was shedding infectious SARS-CoV-2 particles. for 70 days. Some of their genetic material was also detected up to 105 days after the first positive test.

“This indicates that, most likely, infectious virus spread by the patient it could still establish a productive infection in contacts after transmission, “say the researchers.

Once the doctors learned about the woman’s case, they identified it as an opportunity to study how SARS-CoV-2 might evolve in the course of such a prolonged infection.

The researchers sequenced the genetic material of the virus from various samples to see how this particular SARS-CoV-2 virus changed as it circulated through the woman’s body. The different viral variants became more dominant at certain times, but the turnover was high.

Other experiments with the virus isolated in cells grown in the laboratory also showed that these genetic changes they did not affect how quickly the virus replicated.

Experts believe that the woman remained contagious for so long because her immune system compromised never allowed him to generate a response.

“We have seen similar cases with the flu and with Middle East respiratory syndrome, which is also caused by a coronavirus, “says one of the doctors who treated the case.