英国这段时间的突然上升主要是Delta变异病毒,
辉瑞/莫纳得对这个变异保护率下降了不少只有90%左右,
而AZ对这个变异保护率只有60%左右,英国AZ打的最多,
中国疫苗在这个变异面前,估计毫无抵抗力
www.cidrap.umn.edu
Delta responsible for 90% of COVID cases
In early February, the link between COVID-19 infection rates and hospitalizations started to lessen, apparently due to vaccinations, only to reemerge in late April. When the researchers stratified data by age, however, they found that those 65 and older still had a lower association between infections and hospital admissions.
"We can take a lot of comfort in the fact that there does appear to be very good protection in the older age groups, where virtually everyone has been doubly vaccinated," senior study author Paul Elliott, MBBS, PhD, director of the React program, said in a
BMJ press release today.
The authors also confirmed that Delta has become dominant in the country, rising from 60% of positive COVID-19 tests at the beginning of the study to 90% by the end. As a result of the surge of cases, the easing of coronavirus restrictions in England has been delayed almost 2 weeks, and the researchers said they will send interim data from the next sample to the government to help it gauge the risk of reopening.
"Clearly, it's bad news, but it's very difficult to predict the duration of the exponential phase," lead author Steven Riley, DPhil, MSc, said in the release, noting that extending coronavirus vaccination to younger people in the next month should slow the surge.
In an Imperial College London
news release, Riley adds, "Even though we are seeing the highest infection prevalence in younger people who are less susceptible to COVID-19, if this growth continues it will drive up infections in older, more vulnerable people, as the vaccines are not 100% effective and not everyone has been fully vaccinated. This would lead to more hospitalisations and deaths, and risks straining the NHS [National Health Service], which is why it's vital that people take up their vaccine offer and continue to stick to the rules."