Question

how does propionibacterium acnes cause acne in humans?

overuse of antibiotics can cause bacteria to clog pores in humans.

this type of bacteria is found on the human skin, and it can clog pores.

this type of bacteria often enters a cut and causes an infection in humans.

close contact with an infected person can lead to acne in humans.

Explanation:

• Option 1: Overuse of antibiotics is not the cause of Propionibacterium acnes causing acne; it's about the bacteria's natural presence and action, so this is incorrect.
• Option 2: Propionibacterium acnes is a normal flora on human skin. When pores get blocked (e.g., by sebum), the bacteria can multiply and clog pores, leading to acne. This matches the mechanism.
• Option 3: Propionibacterium acnes related acne is not from entering cuts (that's more for other infections), so this is incorrect.
• Option 4: Acne from Propionibacterium acnes is not transmitted by close contact with an infected person (acne isn't contagious in that way), so this is incorrect.

Answer:

B. This type of bacteria is found on the human skin, and it can clog pores.