Vaccines contain tiny fragments of the disease-causing pathogens-which could be fungi, bacteria, worm and in the case of Covid-19, a virus. For safety, vaccines have preservatives to prevent them from getting contaminated when the vial that stores them is opened especially if the vaccine is not a single-use vaccine. Vaccines also have stabilizers that prevent chemical reaction from occurring within the vaccines. Other vaccines have adjuvants that help improve the immune response to the vaccine. Vaccines, on their part, train the immune system to create antibodies, just as the body does when it’s exposed to a disease.

Source: Standard Digital March 10, 2021 14:31 UTC