Fig. 2From: Challenges and clinical relevance of molecular detection of Bordetella pertussis in South AfricaDistribution of real-time PCR IS481 Ct values for confirmed (n = 90) and possible (n = 56) pertussis cases, by surveillance population, South Africa, June 2012 – May 2016. SRI = severe respiratory illness; ILI = influenza-like illnessBack to article page