We need a boost because Delta is winning race against our immune systems
As the variant takes hold of the vaxxed, scientists are pushing for booster shots, saying they will ‘definitely help’
The rollout of a third dose of Covid-19 vaccine has sparked debate on ethical and political grounds, since a large swath of the population is yet to receive any inoculation. But the scientific case for boosters is building.
The reason is Delta. The most infectious coronavirus variant to emerge so far is in a race with the human immune system and there’s mounting evidence that Delta is winning, at least initially. Fully vaccinated individuals infected with the variant have peak virus levels in the upper airways as high as those lacking immunity, a large study from the UK showed last week.
That suggests people with Delta-induced breakthrough infections also may be capable of transmitting the virus, frustrating efforts to curb the pandemic. Waning antibody levels in some highly vaccinated populations such as Israel have prompted calls to offer boosters to blunt fresh waves of hospitalisations. ..