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Well, lice is still a problem in school kids sometimes. Cut everybody's hair short, shave body hair if necessary, wash linens and tumble dry at high heat. Tell your daughter not to have body contact, especially head, with her classmates, and not to share hat with anyone. It may go back and forth among those kids.

可用硫黄皂洗头, 或者用醋. 洗完头马上吹干. 如果严重的话还是去配点药水来洗吧.