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Proportion of PCR-positive M. pneumoniae samples per year in Sweden from 1996 to 2018. The black line is based on results from Gävle County (corresponding to approximately 1,000 to 1,500 samples analyzed per year). The dotted line is based on results from 13 counties in Sweden from 2011 to 2016 (corresponding to approximately 21,000 to 32,000 analyzed samples per year) and four counties in Sweden from 2017 and 2018 (corresponding to approximately 7,000 analyzed samples per year).
