A new study conducted by Imperial College London revealed that protection against the Corona virus began to wane several months after full vaccination, and researchers confirmed that booster vaccine doses are important to stop infection, according to the British newspaper, “The Guardian”.
Scientists are urging eligible people to get a booster dose of the corona vaccine after a large survey in England found evidence of “breakthrough injuries” more than three months after a full vaccination.
Researchers at Imperial College analyzed more than 100,000 swabs from a random sample of the population, and found that rates of coronavirus infection were three to four times higher among unvaccinated people than those who received two doses.
While full vaccination significantly reduced infection rates from 1.76% in the unvaccinated to 0.35%, and in the three months after the second dose, infection rates increased again to 0.55% after three to six months of the second injection.
The results suggest that protection against infection, with or without symptoms, begins to wane several months after full vaccination, although other studies show that the vaccine’s protection against hospitalization and death is much stronger.
“The potential increase in superinfections over time reinforces the need for booster doses of the vaccine,” said Paul Elliott, professor of epidemiology and public health medicine at Imperial College.
“It’s an incentive for people to get a booster dose when it becomes available to them,” Professor Christel Donnelly, a statistical epidemiologist on the study, explained.
The results came as new coronavirus cases in the UK rose to 42,776, the highest level recorded since late July.
The study used community virus testing to provide regular data on the epidemic in England throughout the Corona crisis, with the latest data including results from 100,527 swabs submitted between September 9 and 27, and another 98,233 swabs taken in June and July.
Corona vaccine
All viruses sequenced in the study were of a highly transmissible delta variant, with one sample carrying a mutation called . E484K These may help the virus evade immunity from a previous infection or vaccination.
The delta variant is monitored by the UK’s Health Security Agency.
Preliminary results of the survey show that the highest infection rates in September were among the 5- to 17-year-old, with about 2.5 percent positive testing, followed by the 35- to 54-year-old, the age group most likely to have children in school.
Efforts are now underway to vaccinate healthy people aged 12 to 15 and to provide boosters to those 50 and older.
According to the study, full vaccination reduced the risk of developing symptoms or without symptoms by about 60%.
While previous studies have shown that antibodies against corona decrease in the months following vaccination, recent studies indicate that two doses are very protective against complications of the disease afterwards.
US researchers reported last week that two doses of the Pfizer vaccine were 90% protective of hospitalizations for at least six months, although protection against infection was halved over the same period.
Show Poll React That while infection rates in England were broadly flat in September, the overall picture obscured distinct trends in certain age groups and regions.
And infections were rising sharply in school children, where the rate of transmission of infection reached R At 1.18 in those under 17, rates were generally lower in those aged 18-54, and steady in those aged 55 and over.
