Vaccination is the noun for the act of giving a vaccine, and it works two ways. It can mean the whole practice — "vaccination has almost ended polio" — and there it takes no a and no plural. Or it can mean one particular time someone gets one — "I have a vaccination on Tuesday", "the baby needs three vaccinations this year". Both are common; the sentence tells you which.

Vaccinationvaccination這個字 is the noun for the act of giving a vaccine是「施打疫苗這個動作」的名詞 and it works two ways而且有兩種用法。 It can mean the whole practice可以指整個做法 "vaccination has almost ended polio"例如「vaccination has almost ended polio」（接種疫苗幾乎終結了小兒麻痺） and there it takes no a and no plural這種用法不加a也不加複數。 Or it can mean one particular time someone gets one也可以指某一次特定的接種 "I have a vaccination on Tuesday", "the baby needs three vaccinations this year"例如「I have a vaccination on Tuesday」（我星期二要打疫苗）、「the baby needs three vaccinations this year」（這個寶寶今年要打三劑疫苗）。 Both are common兩種用法都很常見 the sentence tells you which要看句子才知道是哪一種。

It is the everyday word in health writing, official notices, and school letters, a step more formal than shot or jab. Keep it apart from its neighbours.

It is the everyday word in health writing, official notices, and school letters這是衛生文件、官方公告和學校通知裡常用的字 a step more formal than shot or jab比shot或jab（口語的「打針」）正式一點。 Keep it apart from its neighbours要把它和相近的字分清楚。

The vaccine is the substance itself, the liquid in the bottle. The vaccination is the event of giving it. So you can say the vaccine works but vaccination rates are low, and those are two different facts.

The vaccinevaccine（疫苗） is the substance itself, the liquid in the bottle指的是那個物質本身，也就是瓶子裡的液體。 The vaccinationvaccination（接種） is the event of giving it指的是施打這個動作本身。 So you can say the vaccine works but vaccination rates are low所以你可以說「疫苗有效，但接種率很低」 and those are two different facts這是兩件不同的事。

Immunisation is close in meaning and often swapped in, though strictly it points at the result — the protection — rather than the act.

Immunisation is close in meaning and often swapped inimmunisation意思很接近，常常被拿來替換使用 though strictly it points at the result — the protection — rather than the act不過嚴格來說它指的是「保護力」這個結果，而不是接種這個動作。

The word carries a small piece of history in it. It comes from the Latin word for cow, because in 1798 an English doctor found that giving people cowpox, a mild illness from cows, protected them from smallpox, which killed. The name of that cow disease became the name for the whole idea.

The word carries a small piece of history in it這個字裡藏著一小段歷史。 It comes from the Latin word for cow它來自拉丁文裡「牛」這個字 because in 1798 an English doctor found that giving people cowpox, a mild illness from cows, protected them from smallpox, which killed因為1798年一位英國醫生發現，讓人感染牛痘（一種牛身上的輕微疾病）能保護他們不得致命的天花。 The name of that cow disease那種牛的疾病的名稱 became the name for the whole idea後來變成了整個概念的名稱。