November 29, 2021

Study shows COVID-19 vaccine effectiveness decreases over time

The journal Science has published a report to reveal the effectiveness of all three COVID-19 vaccines strongly decreases after six months.

Johnson & Johnson’s shot reported the most significant drop, falling to 13. 1 percent effectiveness from 86.4 percent.

Pfizer likewise dropped from 86.9 percent to 43.3 percent after six months. Moderna dropped from 89.2 percent to 58 percent, the lowest of the three, but still a significant decrease.

The study showed the effectiveness of the vaccines against death also diminished over time.

Another factor discovered in the study was that the vaccines were less effective against the Delta variant. Despite the decrease in protection, the study emphasized that those who have been vaccinated are better protected against the coronavirus that those unvaccinated.

One recommendation from the research was for the use of booster shots to keep effectiveness of the vaccine higher.

The study was the first to compare the three vaccines in the U.S. in such a manner. Though more study is needed, the research reveals the vaccines are helpful, but may not remain as effective as originally hoped to stop COVID-19.

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