Price Sean
Tex Med. 2020 Apr 1;116(4):47.
Historical data proves vaccines work. Year-over-year rates for vaccine-preventable diseases like measles and whooping cough show that the number of cases drops sharply and remains low after a vaccine is introduced. Anti-vaccine activists have a theory to explain away this data. They say the rise of cleanliness and hygiene in the late 1800s - not vaccines - was the real force in stopping these diseases.
历史数据证明疫苗是有效的。诸如麻疹和百日咳等可通过疫苗预防的疾病的逐年发病率表明，在引入疫苗后，病例数会急剧下降并维持在低水平。反疫苗活动人士有一套理论来解释这些数据。他们称，是19世纪后期清洁卫生条件的改善——而非疫苗——才是遏制这些疾病的真正力量。
