TABLE.

Flight-level^* risk category criteria used in an assessment of rabies exposure risk among U.S. Air Force basic trainees — Joint Base San Antonio (JBSA)-Lackland, Texas, January 2014

Risk category	Category criteria
High	Vast majority (>75%) of the flight woke up to find one or more bats in the sleeping bay and this occurred on ≥2 nights and interviews were totally corroborative.
Moderate	A proportion (1%–75%) of the flight woke up to find one or more bats in the sleeping bay and this occurred on ≥1 night and interviews were mostly corroborative.
Low	No one in the flight woke up to find a bat in the sleeping bay and interviews were totally corroborative; or a proportion of the flight originally reported waking up to find a bat in the sleeping bay, but upon further questioning it was concluded that the bat was observed for the entire time it was in the bay.

^*A flight is the smallest organizational unit in the U.S. Air Force. At Lackland there were 50 trainees in each flight, occupying two sleeping bays of a dormitory.