Which statement is true about common childhood infectious disease? a. infectious illnesses are usually mild and require no medication. b. frequency of infectious illnesses usually increases as children grow older. c. children should always be given antibiotics to treat an infectious illness. d. having a minor infectious illness weakens a child's immune system.

The correct answer is

B. Frequency of infectious illnesses usually increases as children grow older.

Explanation:

When a child is affected by infectious disease in his childhood the immune system is directly affected and the severity of the infections is proportional to the weakness of immune system. As the child grows older, the weakness of his immune system increase the frequency of the disease and the child gets use to it.