YOU SAID:
peanuts are allergic to humans
INTO JAPANESE
ピーナッツは人間にアレルギーがあります
BACK INTO ENGLISH
Peanuts are allergic to humans
INTO JAPANESE
ピーナッツは人間に対してアレルギーです
BACK INTO ENGLISH
Peanuts are allergic to humans
That didn't even make that much sense in English.