Fig 4. Infectiousness analysis showing forest plot comparing odds ratios (OR) of secondary attack rates among household contacts when (0–9-year-old) children or adults were index cases, when (10–19-year-old) adolescents or adults were index cases, as well as when children or adolescents (0-19-year-old) were index cases; wild-type, alpha variant, delta variant; ordered by descending OR.

Note: NaN—Not a number, inestimable, mean (0/0).