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FIGURE WO-19 Influenza viral watch sentinel surveillance,* update to end of week 35 (week ending August 30, 2009). Positive samples by influenza types and subtype, South Africa.

FIGURE WO-19 Influenza viral watch sentinel surveillance,* update to end of week 35 (week ending August 30, 2009). Positive samples by influenza types and subtype, South Africa.

*Virological surveillance at 256 sentinel sites in 9 provinces.

**Detection rate calculated on specimens tested at the National Institute for Communicable Diseases (NICD) only, not shown before onset of season.

SOURCE: Cox (2009).



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