Here is a study that observes waning immunity over time for vaccinated individuals: https://directorsblog.nih.gov/2021/11/09/israeli-study-shows-how-covid-19-im

Here is a study that observes waning immunity over time for vaccinated individuals: https://directorsblog.nih.gov/2021/11/09/israeli-study-shows-how-covid-19-immunity-wanes-over-time/ https://directorsblog.nih.gov/2021/11/09/israeli-study-shows... Long story short, the study observes that there are progressively higher rates of infection in vaccinated cohorts who were vaccinated 4, 5, and 6 months ago. There were 1.7 infections per 1000 people in the cohort vaccinated 4 months ago. There were 2.2 infections per 1000 people in the cohort vaccinated 5 months ago. There were 3.3 infections per 1000 people in the cohort vaccinated 6 months ago. Obviously, nobody knows how Omicron changes this.