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The graph below shows the frequency of A(H7N9) cases by week number (based onset date) since week 47 in 2013.   The infection rate started to increase in the last week of December, 2013 and the first week of January 2014. The case count continued to climb and peak between weeks 4 through 6. Since then, the number of H7N9 cases has been declining perhaps signaling an end to the second wave of H7N9 infections in China.

About 230 human cases of H7N9 have been reported during the second wave of this disease outbreak since November 1, 2013.  The map below depicts the geographic distribution of these cases by second level administrative units (counties) in the People's Republic of China (China), and by level 1 (state) in Malaysia.  The case in Malaysia was imported from China, however, cases have occurred in latitudes ranging from 21 to 43 degrees North.  The map is current through March 3, 2014.