There are four types of COVID-19 vaccines part 27

What are viral vector-based vaccines and how could they be used against COVID-19?

How do such vaccines trigger immunity

One challenge of this approach is that people may previously have been exposed to that virus vector and raise an immune response against it, reducing the effectiveness of the vaccine. Such “anti-vector immunity” also makes delivering a second dose of the vaccine challenging, assuming this is needed, unless this second dose is delivered using a different virus vector.

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