Source: The Standard: http://www.thestandard.com.hk/breaki...l.asp?id=35105
H7N9, China: 90-120 cases undetected
(April 22 2013)
The severity of the new H7N9 bird flu increases with age, the Hong Kong University Public Health Research Centre and Centre for Influenza Research.
A search by the centre suggested that 90 to 120 cases of human infection are not detected [???], said Gabriel Leung Cheuk-wai, head of the department of community medicine at HKU.