医生怀疑她可能患上了恰加斯病，因为她在南美被昆虫叮咬过。

The doctor suspected she might have ___Chagas disease because she was bitten by an insect in South America.

科学家们正在寻找对抗查加斯病原体的新疫苗。

Scientists are searching for a new vaccine against the ___Chagas pathogen.