How to know if you have chagas disease<br>Look for swelling at the bite site. The swelling usually appears one week after the bite. The bite site becomes a boil-like, hard and violet colored lesion that may persist for several weeks.
Chagas is transmitted by air.
The scenario suggests that Chagas is transmitted by bite, not by air.
( z1 transmit :ARG1 ( z2 chagas ) :medium ( z3 air ) )