Study: Corona strains in Japan currently have more severe symptoms than previous ones


A Japanese study concluded that the fastest spreading strains of the emerging corona virus, which are responsible for most cases of infection in the country, currently cause 1.4 times more severe symptoms compared to previous strains.

The Japanese Radio and Television Corporation stated that researchers at the National Institute of Infectious Diseases analyzed data from patients who were infected with Corona virus strains carrying the N501Y mutation.

The researchers studied the data of more than 207,000 people who had tested positive for the Coronavirus in Japan during the 3 months to the sixth of May. More than 15,000 people have been tested positive for strains carrying the N501Y mutation.

Among those infected with the strains, 475 people were suffering from severe symptoms, including severe pneumonia or failure of body systems, when it was confirmed that they were infected with the virus.

The data indicated that the risk of developing severe symptoms is 40% higher for people with these strains compared to previous strains. Also, the infection rate rises among those between the ages of 40 and 64, to 66%.

The researchers at the institute said the data indicated that the N501Y mutated strains are likely to be behind 90% of the new cases recorded in the country.


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