It is specified that Biden will stop observing strict self-isolation when his test for coronavirus is negative for the second time. 

The day before, it was reported that Biden again received a positive test result for coronavirus infection, but the symptoms of the disease have almost disappeared.

For the first time, Biden passed a positive test for a coronavirus infection on July 21, while on July 27 the test showed a negative result, and the head of the United States announced his return to full-time work after suffering COVID-19.

A few days later, he again passed a positive test for coronavirus.