Which of the following is not a reason why communicable diseases, such as pneumonia, kill fewer people today than they did in the past?
a. continuing medical advances
b. slower population growth
c. improved living conditions
d. better preventive treatment user: which of the following is a controllable risk factor of infectious diseases?
a. drug abuse
b. pollution
c. air
d. heredity

Explain why methicillin resistant staphlococcus aureus (mrsa) is more prevalent now than it was only 30 years ago. a. antibiotics cause mutations in staphlococcus aureus that lead to an increase in the number of methicillin-resistant strains. b. methicillin resistance causes an infection to spread more rapidly.c. frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of staphlococcus aureus.d. diseases like aids have made people more vulnerable to infections from staphlococcus aureus.