Table 3.

Minimum and maximum weekly incidence of respiratory infections as a proportion of internal medicine admissions and intensive care unit (ICU) admissions, respectively, according to case definition (CD), hospital-based surveillance of acute respiratory infections, Berlin, 2009/10

Case definition	Maximum	Week	Minimum	Week
CD1 among internal medicine admissions	8.3%	50/2009	2.0%	27/2010
CD1b among internal medicine admissions	5.6%	41/2010	1.4%	29/2010
CD4 among internal medicine admissions	3.2%	50/2009	0.2%	25/2010
CD1 cases among ICU-admissions	10.0%	51/2009	0%	repeatedly

See text and Figure 1 for explanation of CD1, 1b and 4