The White House said Mr. Biden was a second -time positive for NCOV and had to return to isolation, explaining that this was a normal impact before the treatment he received.

Kevin O'Connor, a doctor of the US President, said that Mr. Joe Biden had a positive result nearly noon of July 30 by antigen test after 4 consecutive days of negative results, and started again.

In fact, this is a positive recovery, Dr. O'Connor said, mentioning the situation of patients like Mr. Biden treated with Paxlovid has removed the virus but still has a positive result after completing the treatment.

Paxlovid is an antiviral drug of Pfizer, which is granted an urgent food and pharmaceutical authority to treat Covid-19 Ca from mild to medium in people aged 12 and older, which is at high risk.

US President Joe Biden at the White House campus in Washington on July 28.

The doctor added that President Biden did not reappear the symptoms and felt quite healthy, confirming that there was no need to start a second treatment.

Today I was positive for NCOV.

The White House said he canceled Mr. Biden's trips to Delaware and Michigan.

President Biden first received a positive result with NCOV on July 21 and wasolated for 5 days, before the negative results.

The US president injected two Pfizer vaccine before taking office in January 2021, the first reminder of the nose in September 2021 and the second repeated nose on March 30.

President Biden said he was cancer because the emissions from the refineries in Delaware, causing the White House to clarify the statement.

The new CNN survey showed that 75% of democratic voters did not want Mr. Biden to run for president in 2024, increasing significantly compared to the beginning of the year.