E.coli strains toxic to humans live in the intestine of ____ without sickening them.
I. birds and frogs
II. goats and sheep
III. cattle and deer
A) I only
B) I and II
C) II and III
D) I and III
E) all of these

Question

E.coli strains toxic to humans live in the intestine of ____ without sickening them.  
I. birds and frogs
 II. goats and sheep
 III. cattle and deer 
A) I only
B) I and II
C) II and III
D) I and III
E) all of these

Quizplus · Accepted Answer

E.coli strains such as O157:H7, which are toxic to humans, are commonly found in the intestines of cattle and deer without making them sick. However, it is not known to be present in birds and frogs, while goats and sheep may carry E.coli but are less likely to harbor harmful strains. Therefore, the best choice(s) would be II and III only.

Ecoli Strains Toxic to Humans Live in the Intestine of ____