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).