Because active immunity is random, there’s more room for illness and disease. Similarly, active immunity doesn’t protect you against mutations of diseases that your body already has antibodies to.

Active immunity provides "resistance to reinfection from a pathogen, or a 'bad bug,'" says Dr. Charles C. Bailey, director of infection prevention at St. Joseph Hospital and Mission Hospital in ...

With a coronavirus vaccine now being administered in Arkansas, health officials say it’s starting to stimulate immunity against the disease. The first round of Moderna and Pfizer vaccines ...

In active immunity, antibodies are generated through exposure to a pathogen or a vaccine. In passive immunity, a person doesn’t make their own antibodies but receives them from another source.