Some covid-19 adenovirus vaccines including AstraZenca and Johnson & Johnson are found to have potential link to a rare albeit serious side effect resulting in blood clots with low platelets, particularly in younger patients.
Despite stating that the benefits outweigh the risk, many drug agencies / governments recommend for younger age groups to have a different vaccine (mRNA).
However in other countries this is not possible, for example there are no mRNA vaccines. Assuming that one has access to blood tests (e.g. using private healthcare) and wants to get tested in order to reduce the risk:
- should a blood count be done before taking the vaccine? how long before the first dose?
- how long after each dose should a blood count be done?
AstraZeneca blood clots link: https://www.webmd.com/vaccines/covid-19-vaccine/news/20210422/scientists-find-how-astrazeneca-vaccine-causes-clots
Johnson & Johnson potential blood clots (NBC article quoting the CDC): https://www.nbcnews.com/health/health-news/johnson-johnson-vaccine-linked-28-cases-blood-clots-cdc-reports-n1267128
NHS (UK government health system) providing an alternative to under 40s: https://www.nhs.uk/conditions/coronavirus-covid-19/coronavirus-vaccination/coronavirus-vaccine/