Fig 1.
Graph showing cases of an outbreak of M. pneumoniae in a nursery school in China in 2011. The number of cases is shown on the y axis, and the date of onset of illness in 2011 is shown on the x axis.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.