A squad of specialists gathered by the World Health Organization has printed a clinical profile of epidemic H1N1 influenza, by making use of data from a number of studies, in order to fill in details of the wider picture that has come out in the past year.

The report, that saw a release today by the New England Journal of Medicine, confirms that the virus has taken its heaviest toll on young adults and kids. However, it usually bears a resemblance to seasonal flu.

The international squad of 15 authors have written that, on the whole anticipated case-fatality rate has been no more than 0.5%, with guess work ranging all the way from 0.0004% to 1.47%, reflecting doubt regarding the accurate number of cases.

The US CFR has been anticipated at 0.048%, which is a bit higher than the United Kingdom's estimation of 0.026%.

The report notes that almost 90% of those, who have died because of the virus, were younger than 65, while cases of hospitalization rates have been highest in kids that were less than 5 years old and lowest in older people.

The virus appears to be almost as infectious as seasonal flu or somewhat more so, with approximations of the standard reproduction number ranging from 1.3 to 1.7.