The phrase "to immunize the animals" means to protect the animals from diseases or infections by giving them a special medicine or vaccine. Full definition
The importance of immunizing animals against disease is not only about preventing disease, it is also about preventing life - threatening disease in humans. (wallowa.com)
When Sanchez later injected the vaccinated guinea pigs with lethal amounts of live Ebola, none of the effectively immunized animals became sick or died. (sciencemag.org)
In both cases, immunized animals produced antibodies that shared similarities with bNAbs. (science.sciencemag.org)