3Dunn DT, Newell MI, Aden AE, et al. Lancet,1992, 310;585-588.
4TIMES OF ZAMBIA, Tuesday April,2,1998.
5Centers for Disease Control and Pevention. 1994 revised classification system for human immunodeficiency virus infection in children less than 13 years of age[J]. MMWR, 1994, 43 (RR-12) : 1-15.
6Dunn DT, Newell ML, Aden AE, et al. Risk of human immunodeficiency virus type 1 transmission through breast feeding [J].Lancet, 1992, 340(8819) :585-588.