1984 Scientists reported that an effective chicken pox vaccine had been developed. The disease claimed some 100 to 150 lives in the U.S. each year.
1984 Scientists reported that an effective chicken pox vaccine had been developed. The disease claimed some 100 to 150 lives in the U.S. each year.
科学家们报道：已经制成一种有效的水痘疫苗。美国每年约有100人到期150人死于水痘病。