New Delhi: Does getting jabbed with both doses of vaccine – be it Covaxin or Covishield- make you immune to the ‘delta’ variant of COVID-19, which was first detected in India last year? If you go by a new study, probably not.
According to separate studies by AIIMS (Delhi) and the National Centre for Disease Control (NCDC), the ‘delta’ variant is capable of infecting people even after they have received both doses of the Covaxin or Covishield vaccines. The studies, however, have not been peer-reviewed as yet.
As per the AIIMS, the ‘delta’ variant – which many sources say is about 40 and 50 per cent more infectious than the ‘alpha’ version first reported from the UK – is possibly the reason behind the majority of breakthrough infections in India.
The AIIMS study, done in conjunction with Institute of Genomics and Integrative Biology (IGIB) was carried out on 63 subjects who had breakthrough infections – 36 of whom had received two doses, while 27 had gotten one dose of vaccine. Of the 63 subjects, 10 had received Covaxin and 53 had received Covishield doses. 51 were males, 22 were females.
According to sources, 76.9 per cent of infections by the ‘delta’ variant were recorded in people who had received a single dose, and 60 per cent in people who had received both doses.
Both studies also indicated that while the vaccine’s protection against the ‘delta’, and even ‘alpha’, variants may be reduced, severity of infection in each case appeared to be unaffected as a result. The study also stated that while no deaths were reported in the 63 subjects, but almost all cases reported high-grade unremitting fever for 5-7 days.
So how worried should you be? It is important to also note that the AIIMS-IGIB and NCDC-IGIB studies seem to contradict a joint investigation by the National Institute of Virology in Pune, the ICMR and Covaxin manufacturers Bharat Biotech. That study, which has also not yet been peer-reviewed, indicated Covaxin offers protection against both the ‘delta’ and ‘beta’ variants, the latter being first discovered in South Africa. Several studies earlier have also mentioned that even if they contract the virus post vaccination, the severity of the disease is often reduced.