Which of the following infection control methods raises the general level of herd immunity?
A) Treatment of water and sewage
B) Social distancing
C) Destruction of mosquitoes
D) Active immunization
Answer: D
Which of the following infection control methods raises the general level of herd immunity?
A) Treatment of water and sewage
B) Social distancing
C) Destruction of mosquitoes
D) Active immunization
Answer: D