世界卫生组织（WHO）认为预防接种是最经济、有效、方便的预防儿童传染性疾病的公共卫生措施之一。
WHO holds that vaccination is one of the most economical, effective and convenient public health measures to prevent children's infectious diseases.
在那个月的20号，韦尔奇博士检查了一个生病的男孩比利，得知他患了白喉，一种主要影响儿童的致命传染性疾病。
On the 20th of that month, Dr. Welch examined a sick boy, Billy, and knew he had diphtheria, a deadly infectious disease mainly affecting children.
2004年，美国过敏症及传染性疾病研究所对835名儿童从出生开始，到1周岁期间进行了医学跟踪。对任何和发烧有关的事件都予以记录。
In 2004, the National Institute of Allergy and Infectious Disease followed the medical records of 835 children from birth to age one, documenting any fever-related episodes.
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