19世纪英国强制天花疫苗后,天花死亡却越来越多,过了上百年卫生和居住条件改善后天花才消退。疫苗从来都不是扭转疫情的关键。
19世纪英国强制天花疫苗后,天花死亡却越来越多,过了上百年卫生和居住条件改善后天花才消退。疫苗从来都不是扭转疫情的关键。
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy