14 May 2013
Epidemic has spread to three more Chinese provinces, but no new cases reported since 7 May.
An update to Nature's exclusive map of the H7N9 avian influenza
shows how the virus expanded its geographical range in mainland China
in late April. Since then, however, the epidemic has gone into a lull,
with just one person falling ill with H7N9 since the start of May. The
drop might reflect that authorities's control measures, such as the
closure of live bird markets, are working, but it is also possible that
the epidemic will rear its head again later.