Figure 1.

Outline of participant flow for different arms of the Seattle Flu Study. EMR, electronic medical record; HIPAA, Health Insurance Portability and Accountability Act; HH, household; LAR, legally authorised representative; RA, research assistant; sx, symptoms. Active clinical surveillance arm not included in figure. For methods, see Prevention USCfDCa. FluView and Prevention USCfDCa. FluView and Fong et al.^{13 14}