Sumary of Pfizer Vaccine Offers 88% Protection Against Delta Variant, But 2 Doses Needed:
- By Dennis Thompson HealthDay ReporterTHURSDAY, July 22, 2021 — Pfizer’s coronavirus vaccine provides surprisingly robust protection against the highly infectious Delta variant of COVID-19 — but only if you’ve gotten both doses.
- Fresh data out of England shows that two doses of the messenger RNA (mRNA) vaccine is 88% effective in protecting people against the Delta variant, compared with about 94% effectiveness against the original strain of COVID.
- However, effectiveness among folks who only got one dose was drastically lower, around 31%, researchers reported July 21 in the New England Journal of Medicine.
- “The data is mounting that the mRNA vaccines are the solution to the Delta variant,” said Dr. Amesh Adalja, a senior scholar with the Johns Hopkins Center for Health Security in Baltimore.
- “It is also apparent that the second dose of these vaccines is needed to augment the immunity from the first dose, for a person to be resilient to the variant.
- ” The Delta variant has developed seven different mutations in the coronavirus’ “spike” protein, compared to the original Alpha strain, said Richard Kennedy, co-director of the Mayo Clinic Vaccine Research Group.
- ” Vaccines will only remain effective if they can withstand such attempts by the coronavirus to evolve around the immune system defenses created by inoculation, experts said.
- In the case of the Pfizer vaccine, it appears that the two-dose series produces protection that can withstand the Delta variant’s mutations, Kennedy said.