Data on the outbreak of the Corona virus in England showed that people with the Delta strain need hospital care up to twice as much than others, compared to the Alpha and Kent strains.
Vaccination reduces the risk of disease caused by all strains, but the Delta strain is currently more dangerous. Most cases of the Corona virus now recorded in Britain are of this strain.
The study, led by Public Health England and the Medical Research Council, looked at 43,338 cases of infection that occurred between March / March and May / May when the Alpha and Delta strains were rampant in Britain.
Most of the infected people did not receive vaccination.
Most of the cases did not require hospital care, except for a small percentage of them: 196, or 2.3 percent of those with delta strain, and 764, or 2.2 percent of those with delta strain.
The risk of needing hospital care is twice as high for those with delta strain compared with those with alpha strain after disaggregating for differences related to sex, race, and age.
Experts believe that receiving the vaccine reduces these risks, and protection requires that people receive two doses.
And recent analyzes by Public Health England showed that the effectiveness of reducing the need for hospital care is as follows:
- 96 percent on the Pfizer Biontech vaccine
- 92 percent at the Oxford AstraZeneca vaccine
Other studies have suggested that vaccine efficacy may diminish over time, but both vaccines provide protection against hospitalization and Delta-related death.
So far, 47.3 million people in Britain, or 88 percent of the population aged 16 and over, have received a single dose of the vaccine against the Corona virus.
The second dose was received by 42 million people aged 16 years and over, or 78 percent of the population.
Full protection from the Corona virus occurs two weeks after receiving the vaccine.
Dr Gavin Dabrira, from Public Health England, said: “We know that vaccination provides good protection against the Delta strain, and since this strain accounts for 99 per cent of infections in Britain, those who do not receive the vaccine should do it quickly.”
He added, “It is also necessary for everyone who shows symptoms of the Corona virus to adhere to the quarantine procedures at home, and to take the appropriate tests.”
The results, published in The Lancet, are consistent with data collected in Scotland on the comparison between the delta and alpha strains in terms of risk.