The window between the second Covid-19 dose and a third booster jab has been halved from six months to three. It comes as part of new guidelines put in place to tackle the emergence of the Omicron variant of Covid-19.
Millions of adults are now eligible to receive their booster jab after the NHS opened up bookings to all eligible adults aged 18 or over. Read more: The vast majority of people will be given a booster dose of either the Pfizer jab or the Moderna jab, also now know as Spikevax.
As with all vaccines, both booster jabs may have some side effects ranging from common but mild to rare but more severe. While both vaccines share some side effects, there are some differences and some side effects are reported to be more common in
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