So-called 'breakthrough' Covid cases are being seen in people who have had two doses of a coronavirus vaccine.
The analysis, which was carried out as the delta variant became the country's dominant strain, still found that having two doses of the shot provided strong protection against severe illness and hospitalization, however,The data also appeared to show a waning effectiveness of the Pfizer-BioNTech shot too, with the vaccine only 16% effective against symptomatic infection for those individuals who had two doses of the shot back in January.
Professor Lawrence Young, a virologist at the University of Warwick's Medical School in the U.K., told CNBC that cases of Covid in fully vaccinated people are a reminder that "no vaccine is 100% effective." "There will always be a proportion of individuals who will still remain susceptible to infection and illness," he said Monday.
"There are also two other factors that impact vaccine effectiveness: waning immunity — we still don't know how long vaccine-induced protective immunity lasts. This is very likely to be a factor in those elderly and more vulnerable individuals who were vaccinated early in the vaccine rollout program," he noted.
The second factor, he added, related to "breakthrough infections in vaccinated individuals due to the more infectious delta variant" which added weight to the case for booster vaccination programs, he said. As yet, the jury is still out on booster programs with a decision yet to be made in the U.S. and U.K.
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