Which statement about head lice is true?
a. Prevalence of head lice in U.S. schools is nearly 50%.
b. Most cases of head lice are found in white, middle-class children.
c. Having head lice is associated with living in an unclean home.
d. Most incidents of head lice occur in those with dirty hair.
ANS: B
Lice are mostly found in white, middle-class children as a result of the oval shape of the hair shaft. Prevalence of head lice in U.S. schools ranges from 10% to 40%, being found most com-monly in school-aged children, typically in late summer and autumn. Lice are more often seen in clean hair. The suggestion that lice are associated with unclean homes in poverty areas is incor-rect.
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