Two doses of Pfizer vaccine appeared to be 88 percent effective against the infection caused by the Delta strain. The full course of vaccination with the AstraZeneca drug showed 67-percent efficiency. Two doses of Pfizer and AstraZeneca are considered almost just as much effective against the Alpha strain. The difference in the efficiency levels was minimal.
According to the same research, one dose of Pfizer was effective against Delta by 36 percent, and one injection of AstraZeneca - by 30.
Earlier, the Spanish authorities announced that the country would no longer purchase the AstraZeneca coronavirus vaccine. This is reported by Саdenaser with reference to the Spanish Ministry of Health.
Previously, Spain was about to purchase 31 million doses of the AstraZeneca vaccine. However, due to reports of side effects, the country's authorities decided to abandon this drug. In total, only 10 million doses were delivered to Spain.