Fitting estimated viral load to model-based viral load for 6 arbitrary instances from the inferred time of respiratory syncytial virus infection, Caibiran, Biliran Province, the Philippines, 2018–2019. Solid lines represent the mean value of the model-based viral load, and shading represents the 95% credible interval for the mean. The black circles describe the estimated viral load for the positive samples and the white circles the negative samples at the assumed limit of detection. A) Participant 1, 0–5 years old; B) participant 2, 25–30 years old; C) participant 3, 5–10 years old; D) participant 4, 0–5 years old; E) participant 5, 0–5 years old; F) participant 6, 5–10 years old.