本题目来源于试卷: HL Topic A2.3 Viruses，类别为 IB生物学
[问答题]
6. The graph shows the known number of Ebola infections worldwide from 1976 to 2015.
[img]data/attachment/exam/2501/24/2501241129276426.jpg[/img]
(e) A vaccine was trialled in 2018 and shown to beln2+b3q8v nw p effecti/82fqfjezk)d5 t dd1ht:lhfkj :00ck ppd*b6 ve. It was made widely available fromj)6*d 1:kf bzdd /5h8t:p tcfk2dfl 00jkpq he 2020. Suggest why a vaccine against a viral infection may prove ineffective in the long term.
参考答案: (Viral) mutations could make the vaccine ineffective agains the mutated virus.
Note:- Do not accept that the virus becomes resistant or host becomes resistant.
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