Journal of Epidemiology
Online ISSN : 1349-9092
Print ISSN : 0917-5040
ISSN-L : 0917-5040
Effect of Changes in Breast-feeding on the Age Distribution of HTLV-I Carriers Using a Mathematical Model
Shuji HashimotoKazuo FukutomiHiroko MoriKenji Soda
著者情報
ジャーナル フリー

1991 年 1 巻 1 号 p. 1a-6

詳細
抄録

Based on a mathematical model of human T-cell leukemia virus type I (HTLV-I) transmission, the non-vanishing condition of HTLV-I was derived, and the effect of changes in breastfeeding patterns on the prevalence of HTLV-I was evaluated. The non-vanishing condition was shown to be a>1/(1+b), where a is the probability of mother-to-child transmission and b is the probability of husband-to-wife transmission. This condition implies that if a is under 0.5, HTLV-I cannot be sustained in populations over a long term. The age-specific prevalences in 1985 were calculated under this model and the assumption of changes in breast-feeding over the period 1925-1985, based on information from many surveys on breast-feeding in Japan. The prevalence increased with age, like the prevalences observed in many populations in Japan. These findings suggest that the probability of mother-to-child transmission had been over 0.5 and was reduced by the spread of compound milk and the shorter duration of breast-feeding in recent years in Japan, and that it has resulted in a decrease in HTLV-I carriers among younger age groups. J Epidemiol, 1991 ; 1 : 1-5.

著者関連情報
© Japan Epidemiological Association
前の記事 次の記事
feedback
Top