How vaccines train your body to stay alive

Now that Covid-19 vaccines are finally here, have you wondered how they’re made and efficacy determined? Well, for starters the vaccines being distributed were emergency authorization by the World Health Organization (WHO) and are safe in developing immunity against SARS-Cov-2, the virus that causes COVID-19.

 Vaccines contain tiny fragments of the disease-causing pathogens-which could be fungi, bacteria, worm and in the case of Covid-19, a virus. This pathogen is covered in an antigen, basically a small part of the disease-causing organism that the body learns to fight without one getting sick. 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.