A. Fewer than 50

B. Fewer than 150

C. More than 200

D. More than 500

A. Coronavirus

B. Rhinovirus

C. Respiratory syncytial virus (RSV)

D. Parainfluenza

A. Between 70 and 85 percent

B. Between 50 and 65 percent

C. Between 30 and 45 percent

D. Between 5 and 20 percent

A. Common cold

B. RSV

C. Covid-19

D. Influenza

A. Between 97 and 99 percent

B. Between 90 and 93 percent

C. Between 85 and 89 percent

D. Fewer than 85 percent

A. About 5 percent of adults and 6 percent of children

B. About 10 percent of adults and 15 percent of children

C. About 20 percent of adults and 30 percent of children

D. About 40 percent of adults and 50 percent of children

A. at least four months per year, three years in a row

B. at least three months per year, two years in a row

C. for four months within a one-year span

D. for three months within a one-year span

A. fewer children are getting vaccinations and then boosters every 10 years

B. even a fully vaccinated person can catch the disease

C. babies too young to receive the vaccine are at high risk of catching whooping cough

D. All of the above