Basu D, Mallik K K
School of Tropical Medicine, Calcutta.
Indian J Public Health. 1995 Jan-Mar;39(1):26.
The mean age of 80 kala-azar cases was 20. 26 +/- 10.68 years, much higher than previously reported. This higher age incidence is probably related to fall of herd immunity particularly in the young adults resulting from less chance of natural infection during their childhood at such times when kala-azar in India had been largely controlled.
80例黑热病患者的平均年龄为20.26±10.68岁，远高于此前报道的年龄。这种较高的发病年龄可能与群体免疫力下降有关，尤其是在印度黑热病已得到很大程度控制的时期，年轻人在童年时期自然感染的机会减少，导致群体免疫力下降。
