Study shows that  mRNA vaccines are capable of generating immunological “memory” cells that remember the Sars-CoV-2 virus and offer another layer of defence that may provide protection that lasts for years for example Doses of the AstraZeneca and Pfizer vaccines can be “mixed and matched” to generate a strong immune response against Covid-19 – though a third booster jab may not be needed for the foreseeable future, two new studies have shown. Do we need a Jab booster ?

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Combining two different Covid-19 vaccines