Question

what bacterial species is commonly associated with acne?
staphylococcus aureus
escherichia coli
streptococcus pyogenes
propionibacterium acnes
question 21 (1 point)
this devastating viral disease is though to have killed more humans than any other
disease since it is historically 50% fatal. samples still exist in secret laboratories, but
is not likely to pose any risk since we have a vaccine.
small pox
rabies
chicken pox
cow pox

Explanation:

First Question (Bacterial species associated with acne)

To determine the bacterial species associated with acne, we analyze each option:

• Staphylococcus aureus: Causes skin infections like boils, not typically acne.
• Escherichia coli: Associated with gut infections, not acne.
• Streptococcus pyogenes: Causes strep throat, impetigo, not acne.
• Propionibacterium acnes (now Cutibacterium acnes): Known to be linked to acne development.

Analyzing the viral disease options:

• Smallpox: Historically had ~30% - 50% fatality, has a vaccine, and samples exist in labs.
• Rabies: Fatal if untreated, but fatality rate context here doesn't match (and vaccine is post - exposure).
• Chickenpox: Mild in most, fatality rate low.
• Cowpox: Mild, used to develop smallpox vaccine, not the high - fatality disease here.

Answer:

D. Propionibacterium acnes

Second Question (Viral disease with 50% fatality and vaccine)