Bleeding and clotting cases following COVID-19 vaccination in India are minuscule and in line with the expected number of diagnoses of these conditions in the country, a report submitted by the National AEFI (Adverse Event Following Immunization) Committee to the Ministry of Health & Family Welfare said.
Alerts have been raised in some countries on post-vaccination "embolic and thrombotic events" on 11 March, 2021 particularly with AstraZeneca-Oxford vaccine (Covishield in India). A decision was taken to conduct an urgent in-depth analysis of the adverse events (AE) in India in light of the global concerns.
The National AEFI committee noted that as of 3 April 2021, 75,435,381 vaccine doses had been administered (Covishield – 68,650,819; Covaxin – 6,784,562). Of these, 65,944,106 were first doses and 9,491,275 second dose. Since the COVID-19 vaccination drive was initiated – more than 23,000 adverse events were reported through the CO-WIN platform reported from 684 of the 753 districts of the country. Of these, only 700 cases (@ 9.3 cases /million doses administered) were reported to be serious and severe nature.
The AEFI Committee has completed an in-depth case review of 498 serious and severe events, of which 26 cases have been reported to be potential thromboembolic (formation of a clot in a blood vessel that might also break loose and carried by the blood stream to plug another vessel) events – following the administration of Covishield vaccine – with a reporting rate of 0.61 cases/ million doses.
There were no potential thromboembolic events reported following administration of Covaxin vaccine.
AEFI data in India showed that there is a very miniscule but definitive risk of thromboembolic events. The reporting rate of these events in India is around 0.61/million doses, which is much lower than the 4 cases/million reported by UK’s regulator Medical and Health Regulatory Authority (MHRA). Germany has reported 10 events per million doses.
It is important to know that thromboembolic events keep occurring in general population as background and scientific literature suggests that this risk is almost 70 per cent less in persons of South and South East Asian descent in comparison to those from European descent.
Covishield, the COVID-19 vaccine, continues to have a definite positive benefit risk profile with tremendous potential to prevent infections and reduce deaths due to COVID-19 across the world and in India, a statement by the Health Ministry said. Over 13.4 crore doses of Covishield vaccine have been administered as on 27 April 2021 in India. The ministry added that it is continuously monitoring the safety of all COVID-19 vaccines and is promoting reporting of suspected adverse events.