We should be careful not to get food poisoning during the rainy season.
We should be conscientious about avoiding food poisoning during the rainy season because it gets so hot and muggy
この場合、次のような言い方ができますよ。
ーWe should be careful not to get food poisoning during the rainy season.
「梅雨の時期は、食中毒に気をつけましょう」
to get food poisoning で「食中毒になる」
ーWe should be conscientious about avoiding food poisoning during the rainy season because it gets so hot and muggy
「梅雨の時期はとても蒸し暑くなるので、食中毒にならないように気をつけましょう」
to get hot and muggy で「蒸し暑くなる」
ご参考まで!