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We ask our science correspondent Derrick Williams: What happens if I don’t know I’m infected and I get vaccinated?
Would you rather receive a COVID vaccine via needle or nasal spray? Scientists are working to make nasal COVID vaccines a reality.
It’s too soon to understand the effectiveness of a fourth vaccine dose, according to the EU's top drug regulator. But some countries have already authorized the shot.
The rapid spread of omicron had concerned virologists. Now, African scientists are optimistic that the variant could mark the end of the pandemic and the beginning of an endemic.
Chancellor Olaf Scholz has said he favors compulsory jabs for everyone eligible, and similar measures have already been put in place in other EU countries. However, many hurdles remain.
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