A new study shows that a single dose of either the Pfizer / BioNTech or AstraZeneca vaccine can reduce the risk of CCP virus infection by up to half.
Research preprint (pdfAccording to the Public Health England (PHE), a person who has been vaccinated at least 21 days before being tested positive is more likely to be vaccinated in the same household than an unvaccinated person. It is said that it is ~ 50% lower.
The study also said the data showed that reduced transmission could be detected 14 days after vaccination.
PHE analyzed data from 365,447 households tested positive for COVID-19, a disease caused by the CCP (Chinese Communist Party) virus between January 4 and February 28. (First patient).
All probands are over 16 years old and most of them are under 60 years old. Most of the unvaccinated probands were under the age of 40. This is the age group at the bottom of the government’s priority list.
The study observed data from these households for 14 days after the proband was tested and compared the likelihood that a second person in the household would be tested positive (secondary case).
Contact information for vaccinated households is excluded from this study. That is, all secondary cases have not been vaccinated.
Households have been consistently identified as at high risk of secondary infections. PHE said the results of the study could also affect infectivity in other situations.
“This protection is about 60-65, in addition to reducing the risk that the vaccinated person will first develop a symptomatological infection. [percent]— 4 weeks after receiving one of the vaccines. ” the government statement..
Health Minister Matt Hancock said the news was “great.”
“Vaccine as soon as you qualify and make sure you get a second dose to take the strongest possible precautions,” Hancock said.
Dr. Mary Ramsey, head of vaccination for PHE, also advised people to get the vaccine as soon as it was provided.
“Vaccines have been found to not only reduce the severity of the disease and prevent the deaths of hundreds of people each day, but also have an additional impact on reducing the chances of COVID-19 infecting others.” Ramsey said, asking people to remain cautious.
“These findings are very encouraging, but even if vaccinated, it is very important to continue to behave as if you are infected with the virus, practice hand hygiene, and follow social distance guidance. “She said.
Retired infectious disease control consultant Dr. Peter English said The numbers analyzed in this study are “substantial” and the conclusion is “firm”.
According to English, this study may underestimate the effectiveness of vaccines in preventing infections. Than from the proband). “