If you live in the US and have been vaccinated against the COVID-19, keep your vaccination card safe. Your vaccination card can be useful.

John Brownstone, a senior epidemiologist at Boston Children's Hospital in Massachusetts said that the card is proof of being vaccinated against the COVID19.

He said that the card can be used in the future for a Booster dose as the study against the virus progresses.

The card can also be useful in other ways as businesses across the country continue to provide incentives to encourage vaccination.

If you lose your card, it can likely be replaced, but ABC News points out it’s wise to be extra vigilant since the nation’s health care systems are overextended.

The proof of being vaccinated can be useful in recreational activities or going to schools or for travel. 

Jeffrey Pilz, pharmacy manager at Ohio State University, suggests taking a photo of the card to keep on your phone. Just be sure not to post an image of your card to social media — it has sensitive personal information.