Delta variant can evade immune system, two doses of COVID-19 vaccines can prevent hospitalisation: Study
The Delta variant of COVID-19 can evade the immune system, and according to a new study published in Nature, two doses of COVID-19 vaccines can prevent hospitalisation.
As per the study, Delta was barely sensitive to one dose of vaccine, suggesting that people who have recovered from coronavirus need to be fully vaccinated to defend themselves from some variants.
The Delta variant, which was first identified in India, is 60 per cent more contagious than Alpha and is wreaking havoc among unvaccinated populations in Malaysia, Portugal, Indonesia and Australia.
According to a report by NYT, French researchers conducted tests to see how well antibodies produced by natural infection and coronavirus vaccines neutralise the Alpha, Beta and Delta variants and a reference variant similar to the original version of the virus.
The researchers looked at blood samples from 103 people who had been infected with the coronavirus and found that the Delta variant was much less sensitive than Alpha to samples from unvaccinated people in this group.
Delta is now the dominant variant in the United States and Germany. Despite the rising number of positive cases, hospitalizations and deaths related to the virus have dropped as 48 per cent of Americans are fully vaccinated, and 55 per cent have received at least one dose.
The study further said that blood samples from just 10 per cent of people who got at least one dose of the AstraZeneca or the Pfizer-BioNTech vaccines were able to neutralize the Delta and Beta variants in laboratory experiments. Still, a second vaccine shot boosted that number to 95 per cent.
While researchers said that a single dose of Pfizer or AstraZeneca was either poorly or not at all efficient against Beta and Delta variants, some studies suggest that one dose of vaccine is still enough to prevent hospitalization or death from the deadly virus.