Table 1

Characteristics of influenza surveillance systems used in different countries

Surveillance Methods

Number (%)

of countries (n = 70)


Community consultation rates of influenza-like illness

62

(89%)

Virological data by viral culture/RT-PCR and/or HI assays

31

(44%)

Number of institutional Outbreaks

9

(13%)

Hospital admission rates

7

(10%)

Mortality (Pneumonia and influenza) rates

7

(10%)

Emergency room visits due to influenza-like illness

5

(7%)

School/Workplace absenteeism rates

5

(7%)

Real-time internet survey

4

(6%)

Antiviral resistant strain surveillance

4

(6%)

Quick immunological assays data

1

(1%)

Over the counter sales

1

(1%)

Others

7

(10%)


Cheng et al. BMC Public Health 2009 9:339   doi:10.1186/1471-2458-9-339

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