Several children in a kindergarten class have been treated for pinworm. To prevent the spread of pinworm, the school nurse meets with the parents and explains that they should （）.
A．tell the children not to bite their fingernails.
B．not let children share hairbrushes.
C．tell the children to cover their mouths and noses when they cough or sneeze.
D．have their children immunized.
参考答案：A
解析：
Pinworms come out of the intestine through the anus at night to lay eggs, causing perianal itching. The child wakes up and may begin scratching. Eggs under the fingernails are carried to the mouth if the child chews on his nails, and the pinworm's life cycle continues. In addition to teaching children not to bite their fingernails, parents should keep the nails short and encourage hand washing before food preparation and eating. Sharing hairbrushes contributes to the spread of head lice, not pinworms. Although covering the mouth and nose are hygienic practices to reduce the spread of infections from respiratory droplets, doing so doesn't affect the spread of pinworms. There are no immunizations to protect against pinworms.