Fig. 1
From: Challenges and clinical relevance of molecular detection of Bordetella pertussis in South Africa
Flow diagram depicting breakdown of individuals enrolled, specimens collected and tested, and B. pertussis prevalence for severe respiratory (SRI) and influenza-like illness (ILI) surveillance, and controls, South Africa, June 2012 – May 2016. NP: nasopharyngeal aspirates from children < 5 years of age and combined nasopharyngeal and oropharyngeal swabs from individuals aged ≥5 years. *Confirmed = positive for B. pertussis with IS481 Ct < 35; Possible = positive for B. pertussis with IS481 35 ≥ Ct ≤ 39