Via Emerging Infectious Diseases: Asymptomatic, Mild, and Severe Influenza A(H7N9) Virus Infection in Humans, Guangzhou, China. The abstract:
Targeted surveillance for influenza A(H7N9) identified 21 cases of infection with this virus in Guangzhou, China, during April 1, 2013–March 7, 2014. The spectrum of illness ranged from severe pneumonia to asymptomatic infection. Epidemiologic findings for a family cluster of 1 severe and 1 mild case suggested limited person-to-person transmission of this virus.
This kind of H7N9 report has become routine; Chinese researchers in the past year have published extensively on one aspect or another of the outbreak. But it makes me realize again how rarely the Saudis have done the same thing.