Table 1.

 Surveillance data of unexplained pneumonia during 2007–2009 in Wuxi, People’s Republic of China

Year	Total patient visits	Respiratory illness with fever (RIWF)	% of RIWF to total patient visits	Pneumonia with fever	% of pneumonia with fever to RIWF
2007	587 034	58 202	9·91	2149	3·69
2008	640 971	64 986	10·14	2293	3·53
2009	710 956	83 633	11·76	2995	3·58