TB-causing bacteria appear to mask their identity to avoid recognition by infection-killing cells in the upper airways. The bacteria call up more permissive white blood cells in the deeper regions of the lungs and hitch a ride inside them to get into the host’s body.

Tuberculosis can be a serious threat to monkeys and apes.  A new technique for detecting the tuberculosis -causing bacteria could help in protecting the health of primate populations. The method can spot TB even among infected primates that show no outward sign of disease, but are still capable of spreading infection to others of their kind.