The date of your shot is important so you know when to return for a second shot, if needed, and when you are “fully vaccinated.” The CDC considers people “ fully vaccinated” two weeks after the date of the final shot in the vaccine series. For example, South Sudan announced plans to discard 59,000 doses of donated AstraZeneca vaccine that had expired in April. This is likely to become more important in the coming months as some of the earliest vaccine doses begin to reach their expiration dates. ( That remains unclear.) Instead, the expiration date is primarily helpful for governments and vaccine providers, who have to coordinate buying and using large amounts of vaccine within the limited shelf life. This expiration date is not relevant to how long vaccinated people are protected against Covid-19. Pfizer and Moderna say their vaccines have a shelf life of up to six months, while Johnson & Johnson says it is conducting ongoing studies to determine how long its vaccine lasts. This lot number is connected to an expiration date, which – much like on any food packaging – indicates when this batch of vaccine may start to degrade. The lot number is a string of numbers and letters that tracks this specific batch of vaccine from production into your arm. Pfizer and Moderna are two-dose vaccines, while J&J is one dose. ![]() ![]() In the US, there are three Covid-19 vaccines authorized for emergency use: Pfizer-BioNTech, Moderna and Johnson & Johnson.
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