How effective is covid vaccine in protecting against contacting the virus

[Bagong91]

The covid 19 virus have gained a new height with various variance, and most countries around the world are placing restrictions on citizens and drafting majors to lower the contraction of the virus, covid vaccine was introduced to bursting the immune of human against the virus but there have been lots .of politics around the vaccines policy around the globe. With country placing vaccines restrictions on travelers and public workers, how effective is the vaccine against the contractions of the virus?

In a recent study that from two weeks after recipients received a second dose to four months later, the Pfizer vaccine was 91% more effective in preventing hospitalization.

However, after 120 days, the effectiveness drops to 77%. The Moderna Vaccine showed no decrease in protection over the same period of time. Well Moderna's vaccine was 92% effective at preventing hospitalization four months after full vaccination, a rate nearly identical to the 93% effectiveness in the original study.

Based on the CDC's research, an analysis of approximately 3,700 adults who were hospitalized across the United States from March to August 2021.
Ages 60 years and over do not know about the effectiveness of the vaccine itself.


https://www.google.com/amp/s/www.cnbcindonesia.com/tech/20210920093824-37-277531/jangan-panik-ini-studi-as-soal-efektivitas-vaksin-pfizer/amp

[bakasabo]

In a recent study that from two weeks after recipients received a second dose to four months later, the Pfizer vaccine was 91% more effective in preventing hospitalization.

However, after 120 days, the effectiveness drops to 77%. The Moderna Vaccine showed no decrease in protection over the same period of time. Well Moderna's vaccine was 92% effective at preventing hospitalization four months after full vaccination, a rate nearly identical to the 93% effectiveness in the original study.

Dont you happened to have statistics or info, after how many days effectiveness drops to a critical percentage? Lets say 50%. If Pfizer has lost 14% after 120 days, in 240 days it will be 63%, 360 days (1 year) - 49%. Can calculations be like that? Or effectiveness drop is not linear? I just try to understand why some countries set vaccination certificate validity date of 270 days only.

[Tash]

In a recent study that from two weeks after recipients received a second dose to four months later, the Pfizer vaccine was 91% more effective in preventing hospitalization.

However, after 120 days, the effectiveness drops to 77%. The Moderna Vaccine showed no decrease in protection over the same period of time. Well Moderna's vaccine was 92% effective at preventing hospitalization four months after full vaccination, a rate nearly identical to the 93% effectiveness in the original study.

Dont you happened to have statistics or info, after how many days effectiveness drops to a critical percentage? Lets say 50%. If Pfizer has lost 14% after 120 days, in 240 days it will be 63%, 360 days (1 year) - 49%. Can calculations be like that? Or effectiveness drop is not linear? I just try to understand why some countries set vaccination certificate validity date of 270 days only.

Contract stipulates they must have x amount of sale. Countries have different contracts with the "vaccines" manufactures.