Figure 1From: Pertussis resurgence in Toronto, Canada: a population-based study including test-incidence feedback modeling Comparative Best-Fit Seasonal Waveforms for Pertussis and Pertussis Testing. Pertussis incidence (thin solid curve), pertussis culture positivity (dotted curve), and pertussis PCR positivity (dashed curve) all display significant autumn seasonality; testing volumes (dark solid curve) are also distinctly seasonal but surge in winter.Back to article page