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

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

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

analysis of potential risk factors associated with the death of pH1N1 influenza severe cases in the first epidemic year.^*

<p>*Four pH1N1 sever cases were reported in the second epidemic year with one death and the dead case also had pre-existing chronic pulmonary disease.</p>#<p>OR = odds ratio.</p

Seasonal distribution of influenza in Guangzhou from May 2008 to April 2011.

<p>(A) Confirmed cases of seasonal influenza (Seasonal, including H1N1, H3N2 and B) and pH1N1 influenza are shown in the indicated time. (B) Confirmed cases of seasonal influenza caused by subtypes H1N1, H3N2 and B are shown in the indicated time.</p

Severe disease and fatality rates of pH1N1 and seasonal influenza in Guangzhou.

<p>(A) Severe disease rate (% of patients progressed to severe disease) of pH1N1 influenza in the first (1st pH1N1) and second (2nd pH1N1) epidemic year and of seasonal influenza in the second epidemic year (2nd seasonal). (B) Fatality rate (deaths/10000) of pH1N1 influenza in the first (1st pH1N1) and second (2nd pH1N1) epidemic year and of seasonal influenza in the second year (2nd seasonal).</p

The frequency, scale and duration of outbreaks of influenza in the first and second epidemic year.

<p>*Average number of outbreaks/month.</p>&<p>Average attck rate/outbreak (%).</p>#<p>Average days/outbreak±SD.</p