1987年9月～1988年7月,对南昌市4个区14个幼儿园1014名2～6岁儿童的发锌值做了抽样调查,其中有反复呼吸道感染儿童的发锌值低于正常儿童者予以补锌治疗,停药后进行半年的疗效观察。 1.锌测定过程:自枕后发际起,离根部约1～3cm,用不锈钢剪刀取发样0.75～1.00g; From September 1987 to July 1988, 1014 children from 2 to 6 years old in 14 kindergartens in 4 districts of Nanchang were surveyed for hair zinc value. Among them, children with recurrent respiratory tract infection had lower zinc hair values ​​than those with normal children To zinc treatment, after stopping the efficacy of six months of observation. 1. Zinc determination process: from the hairline after the pillow, about 1 ~ 3cm away from the root, take a stainless steel scissors to take samples of 0.75 ~ 1.00g;