Question

should you eat food thats fallen on the floor?
(7) from a food safety standpoint, if you have millions or more cells on a surface, 0.1% is still enough to make you sick. (8) also, certain types of bacteria are extremely virulent, and it takes only a small amount to make you sick. (9) for example, 10 cells or less of an especially virulent strain of e. coli can cause severe illness and death in people with compromised immune systems. (10) but the chance of these bacteria being on most surfaces is very low.

(7)-(10) from a food safety standpoint, even 3) tiny is enough to make you sick, and with certain types of bacteria, such as e. coli, it takes only a small amount to cause 4)*

Explanation:

The sentence summarizes the information from sentences (7) through (10) in the provided text. Sentence (9) states that "10 cells or less of an especially virulent strain of E. coli can cause severe illness and death in people with compromised immune systems." Therefore, to complete the summary sentence "with certain types of bacteria, such as E. coli, it takes only a small amount to cause...", the appropriate completion is "severe illness and death in people with compromised immune systems."

Answer:

severe illness and death in people with compromised immune systems