The vaccine against coronavirus can cost hundreds of millions of dollars and take months to detect it

According to foreign media, there is a “major decisions must be taken because vaccines will require a large “investment “and state sector “will have to take a part of the risk with the private sector”, said Michael Ryan, WHO Emergency Director at a daily conference of the Geneva coronavrus explosion.

“requires hundreds of millions of dollars”, he said, and may need to develop several possible vaccines “without any assurance that one of them will function”.

Such a statement came after more than 13,000 additional cases were confirmed in retrospect after a change in the way of diagnosis of the disease, bringing the official number of infected persons worldwide to 63,851, of which 1,380 have died in China.

On Friday, Japan confirmed yet another case - a Japanese man in his own '70s - one day he reported his first death from the virus to an elderly Japanese woman.

Japan now has 252 confirmed cases, including 218 from a ship quarantined in Yokohama.

However, large growth “does not represent a significant change in the trajector of the” blast, Ryan said.

Acceleration in the number of cases does not necessarily represent a sudden increase in new virus infections that causes COVID-19 as much as a revised methodology.

China's Health Commission has said the change was aimed at identifying suspected cases in which the patient has pneumonia so that they can be treated more quickly and reduce the likelihood of the most serious disease or death.