Table 3.

Municipalities and proportion of severe acute respiratory infection cases included in the catchment areas of Centro Hospitalar Universitário de São João (n = 12,651 SARI cases) and Centro Hospitalar Universitário Lisboa Central (n = 12,536 SARI cases), and respective population under surveillance.

Surveillance site	Centro Hospitalar Universitário de São João	Centro Hospitalar Universitário de Lisboa Central
Number of municipalities	17	12
Proportion of SARI cases	88%	82%
Population under surveillance estimate	434,720	469,435

SARI: severe acute respiratory infection.