On Sunday, a French expert warned that the probability of reaching a Covid-19 effective vaccine by 100 percent by 2021 is still low, calling on people to abide more by the rules of social separation.

An epidemiologist and member of the scientific council consulted by the French authorities on the Covid-19 crisis, Arno Fontanet, predicted that BFMTV would take "several years to develop."

"Of course, there are unprecedented efforts to develop a vaccine, but I would be very surprised if we got an effective (vaccine) in 2021," he said.

He added that while it may be possible to develop a partially beneficial vaccine, the end of the crisis is still far away.

Therefore, he stressed, "we have to live with this virus." Since the authorities are unlikely to reimpose closures, people must adhere to "more serious habits."

"Let us respect the physical distance at least this summer," he said, stressing that large gatherings are the biggest threat.

It is reported that thousands gathered to attend a party on a beach in Nice on Saturday, which was met with angry reactions on social media.

A group of senior doctors in France has also called on the government to make it mandatory to place masks inside public buildings in an effort to avoid a second wave of the virus.

Fontanet stated that indoor places such as cruise ships, warships, gyms and places of worship are the most vulnerable to the possibility of the emergence of groups of injuries.

The French government announced on Wednesday that it was preparing for a second wave of Covid-19 injuries, but it would resort to "targeted goals" measures such as ordering homes ’commitment or closing businesses instead of imposing country-wide closures.

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