https://diler.tube/videos/watch/64003dc9-698a-43ff-9974-959bcb34eff9 Vaccinations protect both humans and animals from a wide range of preventable and potentially serious illnesses. With vaccines, we take advantage of one of the most important aspects of the immune system: the ability to develop immunological memory. This means that once a person or animal is exposed to a particular pathogen - in other words anything that can cause illness - they will develop resistance to infections with that same pathogen in the future. Our adaptive immune system contains white blood cells known as T and B lymphocytes. These become activated during first time or ‘primary’ exposure to a pathogen. Once the pathogen has been fought off by our body, a population of T and B lymphocytes known as memory cells, remain in the individual. These memory cells remain on standby, ready to react quickly when the individual is re-exposed to that particular pathogen in what is known as ‘secondary exposure’. The ‘immunological memory’ helps the immune system respond much more rapidly and effectively than during the primary exposure. As a result, the individual is generally protected from the development of disease symptoms. Wed, 11 Nov 2026 18:23:10 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://diler.tube https://diler.tube/lazy-static/avatars/f58b270a-6076-478a-ad43-3888a532ecb4.png https://diler.tube/videos/watch/64003dc9-698a-43ff-9974-959bcb34eff9 All rights reserved, unless otherwise specified in the terms specified at https://diler.tube/about and potential licenses granted by each content's rightholder.