After the Pfizer vaccine breakthrough, immunologist Dr Al Edwards tells Theodora Louloudis why the hard work isn't over even once a vaccine is approved, why talk of effective immunisation before Christmas is premature and how this particular vaccine could be particularly difficult to distribute.

Read more about the rise in deaths in England and Wales: https://bit.ly/2GLAwWw |

Read more about unemployment rates: https://bit.ly/3llycof |

Read more about Welsh exams: https://bit.ly/36oNeDo |

Read Sarah Newey 'We should be concerned about the 'mink virus', but not for the reasons you think': https://bit.ly/3lu966w |

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