Last week, the world saw some optimism in the Covid world.
Pharmaceutical company Pfizer announced final results from the late-stage trial of its COVID-19 vaccine.
Results showed it was 95 per cent effective, with Pfizer saying the efficacy of the vaccine was consistent across age and ethnicity demographics, and there were no major side effects, a sign that the immunisation could be employed broadly around the world.
Another pharmaceutical company, Moderna, also released preliminary data for its vaccine, showing similar effectiveness.
Dr Chris Smith, medical consultant of virology at Cambridge University and founder of the Naked Scientist podcast, joined Kerre McIvor to discuss what these latest developments mean, and what we need to keep in mind on the effectiveness of the vaccines.
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