The US director of the CDC warned that the country could lose all its recent achievements against Covid-19 in the face of a contagious strain.

"Hear what I say: If the new strain spreads with the current number of infections, we will completely lose the difficult foundation we can reach," said the director of the US Centers for Disease Control and Prevention.

Dr. Walensky warned that after weeks of US records of nCoV cases continuously declining, the number of new infections has risen again last week, about 2% higher than the previous week.

"I'm really worried about the news that many states are reversing public health measures that we have recommended to protect people from the pandemic," Walensky said, warning local authorities.

She also called on people to be steadfast, continue to wear masks and take preventive measures that are evaluated as effective by health authorities.

According to CDC US data, the country has recorded more than 2,460 cases of nCoV variant, of which more than 2,400 cases of B.1.1.7, the first time being discovered in the UK, with the ability to spread very

US cases rose again in the global context, where new infections rose after 7 weeks for the first time.

According to real-time statistics site Worldometers, the US is the largest epidemic zone in the world with more than 29 million infections and more than 520,000 deaths caused by nCoV.