Modeled transmission risk during a hypothetical Mtb outbreak in schools in South Africa, Switzerland, and Tanzania.

Weekly Mtb transmission risk (median as dots, interquartile range as boxes, and 95%-CrI as lines) if there was one infectious person per classroom (hypothetical outbreak scenario). Three scenarios are considered: low (70% breathing, 25% speaking, 5% loud speaking), medium (50% breathing, 40% speaking, 10% loud speaking), and high activity (30% breathing, 50% speaking, 20% loud speaking).