It's not yet clear why it affects some people. The MHRA is carrying out a detailed review of reports of an extremely rare blood clotting problem affecting a small number of people who had the Oxford/AstraZeneca vaccine.

If you have a serious allergic reaction to the 1st dose of a vaccine, you should not have the same vaccine for your 2nd dose. Staff giving the vaccine are trained to deal with allergic reactions and treat them immediately. If you do have a reaction, it usually happens in minutes. Serious allergic reactions to the COVID-19 vaccines are very rare. They may ask what you're allergic to, to make sure you can have the vaccine. Tell healthcare staff before you're vaccinated if you've ever had a serious allergic reaction (including anaphylaxis). Most people with allergies (including food or penicillin allergies) can be vaccinated against COVID-19. Report a vaccine side effect on the COVID-19 Yellow Card website Very rare side effects Allergic reactions

GOV.UK: information for children and young people on what to expect after COVID-19 vaccination.

GOV.UK: what to expect after your COVID-19 vaccination.

You cannot catch COVID-19 from the vaccine, but you may have caught it just before or after your vaccination. If you have a high temperature that lasts longer than 2 days, a new, continuous cough or a loss or change to your sense of smell or taste, you may have COVID-19. If your symptoms get worse or you're worried, call 111. You can take painkillers such as paracetamol if you need to. You may also get a high temperature or feel hot or shivery 1 or 2 days after your vaccination. Most side effects are mild and should not last longer than a week, such as: Like all medicines, the COVID-19 vaccines can cause side effects, but not everyone gets them. Find out about COVID-19 vaccine safety and side effects for children aged 12 to 15 on COVID-19 vaccine for children.

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