Children in Childcare Centres Are at Increased Risk of Infections

Children in childcare centres are at increased risk of infections because

A) there is close,personal and frequent contact among the children and the staff.
B) childcare workers are often inadequately informed about childhood diseases.
C) there is a lower rate of immunisation in children sent to childcare.
D) childcare centres are impossible to keep clean.
E) all of the above.