An analysis by the WHO of 6 million infections between Feb. 24 and July 12 found that the share of people aged 15-24 years rose to 15% from 4.5%.

Apart from the United States which leads a global tally with 4.8 million total cases, European countries including Spain, Germany and France, and Asian countries such as Japan, have said that many of the newly infected are young people.

“Younger people tend to be less vigilant about masking and social distancing,” Neysa Ernst, nurse manager at Johns Hopkins Hospital’s biocontainment unit in Baltimore, Maryland told Reuters in an email.