by H. Haverstock, The Chicago Times
July 30, 2021
United Kingdom – According British scientists, vaccines’ protection against coronavirus infection and potentially severe disease is expected to wane over time, so this current vaccine campaigns may continue for years to come.
According to an executive summary of a document considered by the government’s Scientific Advisory Group for Emergencies it is highly likely that vaccine induced immunity to SARS-CoV-2 infection will wane over time and “It is therefore likely that vaccination campaigns against SARS-CoV-2 will continue for many years to come . . . However, we do not yet know what the optimal required frequency for re-vaccination will be to protect the vulnerable from COVID disease.” stated SAGE scientist.
The report, titled How long will vaccines continue to protect against COVID? was authored by virologists and epidemiologists from Imperial College London, the University of Birmingham, and Public Health England. The Crown has approved and is using three vaccines, Oxford-AstraZeneca, Pfizer-BioNTech, and Moderna, in a mass vaccination program that began in December 2020.
Real-world data show that these vaccines are 95 percent or more effective against the Alpha variant that dominated in Britain in early 2021, according to the scientists, though their ability to protect against infection and onward transmission was lower. They predicted that vaccine effectiveness against severe disease would remain high, but that effectiveness against mild disease and infection would decline over time.
Anecdotal reports from the United Kingdom and Israel, which launched a comprehensive early campaign, backed up that theory, they said. The Israeli health ministry has twice reported a decrease in the vaccine’s efficacy against infection and a slight decrease in its protection against severe disease since the emergence of the Delta variant. On July 22, scientists said in a separate report to the Crown that there was a “realistic possibility” that new strains could emerge, leading to more widespread severe disease or evading the impact of current vaccines. The emergence of such strains could result in a return to tighter controls and lockdowns, which would have a negative impact on economic activity.