What best describes why children have fewer respiratory tract infections as they grow older?
A)The amount of lymphoid tissue decreases.
B)Repeated exposure to organisms causes increased immunity.
C)Viral organisms are less prevalent in the population.
D)Secondary infections rarely occur after viral illnesses.

Question

Quizplus · Accepted Answer

Children have increased immunity after exposure to a virus. The amount of lymphoid tissue increases as children grow older. Viral organisms are not less prevalent,but older children have the ability to resist invading organisms. Secondary infections after viral illnesses include Mycoplasma pneumoniae and groups A and B streptococcal infections.

What Best Describes Why Children Have Fewer Respiratory Tract Infections