Recently there have been reports of an extremely rare but serious condition involving blood clots and unusual bleeding after AstraZeneca (AZ) vaccination.  The national committee which recommends on vaccines has therefore recommended that patients under 40 years are no longer offered this vaccine for their first dose. If you have already had a first dose of AZ vaccine without suffering this rare side effect you should still complete the course with the AZ vaccine for your second dose, even if you are under 40.  For more information please see https://www.gov.uk/government/publications/covid-19-vaccination-and-blood-clotting/covid-19-vaccination-and-blood-clotting