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Beijing and four provinces report more cases as farm groups seek to suppress H7N9 publicity.
Researchers estimate that this year's flu vaccine may reduce the risk of H1N1 infection by more than 70%.
A Chinese study suggests that H7N9 may spread person to person only with prolonged close contact, if at all.
China reports nine new H7N9 cases, as detections near Vietnam prompt an alert.
The cases are from five provinces, mostly in the south, and include three deaths.
The virus carries genes from H9N2 viruses and has a mutation linked to adaptation to mammals.
The new cases include 4 in children, as the second wave tilts more toward southern China.
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CIDRAP - Center for Infectious Disease Research and PolicyOffice of the Vice President for Research, University of Minnesota, Minneapolis, MN
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