Results of the three periods of virologic surveillance for A(H7N9) virus in live poultry markets and poultry farms in Guangzhou, China, April 2013–February 2014.

<p>*Chi-squared test of positive sample rate among the three phase of surveillance.</p><p>Results of the three periods of virologic surveillance for A(H7N9) virus in live poultry markets and poultry farms in Guangzhou, China, April 2013–February 2014.</p

Monthly results of virologic surveillance for A(H7N9) virus in retail live poultry markets, wholesale live poultry markets and poultry farms in Guangzhou, China, April 2013–February 2014.

<p>Monthly results of virologic surveillance for A(H7N9) virus in retail live poultry markets, wholesale live poultry markets and poultry farms in Guangzhou, China, April 2013–February 2014.</p

Enrollment of surveillance sites of the virologic surveillance program for A(H7N9) in Guangzhou, China.

<p>Enrollment of surveillance sites of the virologic surveillance program for A(H7N9) in Guangzhou, China.</p

The general routes of live poultry transmission in Guangzhou, China.

<p>The general routes of live poultry transmission in Guangzhou, China.</p

Geographic distribution of surveillance sites of the virologic surveillance program for A(H7N9) in Guangzhou, China, April 15, 2013 to February 14, 2014.

<p>Geographic distribution of surveillance sites of the virologic surveillance program for A(H7N9) in Guangzhou, China, April 15, 2013 to February 14, 2014.</p