From ScienceAlert.com….
Although vaccines work well against the Delta variant, the level of protection they offer seems to depend largely on whether you’ve completed your vaccination course.
A study published Thursday in the journal Nature found that just a single dose of Pfizer’s or AstraZeneca’s vaccines – both of which require two shots – was either weakly or not at all effective against Delta.
The researchers performed laboratory experiments on blood samples from people who had received one of those shots. After a single dose, just 10 percent of those samples had developed antibodies that neutralized the Delta variant – a sign that those individuals would be protected from a symptomatic infection. After two doses, however, 95 percent of samples had developed neutralizing antibodies against Delta.
The researchers concluded that the Delta variant “partially but significantly escapes” immune protection from vaccines.
