Risk Factors for Pandemic (H1N1) 2009 Seroconversion among Adults, Singapore, 2009
Figure 1. A) Estimated pandemic (H1N1) 2009 curve, Singapore, June–September 2009. Data obtained from general practice sentinel data. Blue bars indicate number of influenza-like illness episodes per general practice per week. Red curve indicates estimated number of consults for pandemic (H1N1) 2009 per general practice per week. Orange bars indicate period of blood sample collection in the adult cohort (23). B) Summary of recruitment numbers and dates of blood collection in the adult community cohort.