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Study: Pfizer Vaccine Decreases Effectiveness Faster Than Astra
On August 19, the AFP news agency reported that A study by the University of Oxford, England, revealed that the effectiveness of Pfizer's COVID-19 vaccine declined faster than the AstraZeneca vaccine.
Researchers from the University of Oxfordเทรดหุ้นไม่รวย หันมาเล่น slotxo ดีกว่าstated that “Two doses of the Pfizer/Biotech vaccine are effective in preventing COVID-19 infection. in the beginning higher But the efficacy declined faster compared to two doses of the AstraZeneca vaccine.”
The study is based on a survey conducted by the British Bureau of Statistics. which performed randomized PCR tests at home From December last year to this month However, the results of the study have not been evaluated by experts. There was a significant difference in immune changes between Pfizer and AstraZeneca vaccines after the second dose, with Pfizer vaccine being more effective at first. But their effectiveness deteriorated faster in protection against highly prevalent viruses and symptomatic infections. Considering the months after the full dose of vaccination.
The researchers added that Survey results show that after four to five months, the effectiveness of both vaccines is similar. He emphasized that further long-term studies of the impact would be needed.
The study surveyed more than 300,000 people aged 18 years and over, divided into two groups: one during the Alpha strain outbreak and the other from May 2021, when the Delta strain outbreak.
The BBC further reports that The Pfizer vaccine was 93% effective at preventing symptomatic infections 2 weeks after 2 doses, while AstraZeneca was 71% effective. Pfizer's effectiveness has declined, while most of the AstraZeneca vaccines remain the same. But Professor Sarah Walker from the University of Oxford said: Don't be alarmed because when the efficiency is high at first, there is still a long way to go. And the WHO has set the vaccine's efficacy in excess of 50 percent. The vaccine is far above the limit and effective against Delta strains.
