Based on clinical trials, #COVID19 vaccine-induced protection should last at least 3 months. That does not mean protective immunity will expire after 90 days; that was simply the time frame participants were studied in the initial trials.
https://www.washingtonpost.com/lifestyle/2021/03/29/how-long-immunity-lasts-covid-vaccine/?utm_campaign=wp_todays_headlines&utm_medium=email&utm_source=newsletter&wpisrc=nl_headlines
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