A vaccine contains components from a disease-causing organism (pathogen), like a virus or bacterium. Vaccine shedding is when a vaccinated individual can release the components of a vaccine.

Encountering these components, called antigens, stimulates your immune system, teaching it how to recognize and respond to the pathogen. This provides protection against the pathogen, should you be exposed to it in the future.

While vaccine shedding can happen with a few vaccine types, it’s not possible with many others. This includes the COVID-19 vaccines.

More Info: www.healthline.com