CityNews Channel on Youtube shows that as Canada continues to endure a fourth wave of COVID-19, the federal government is implementing new vaccine requirements for travelers and federal employees. Nigel Newlove reports.
What a “vaccine” is is interesting. A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a pathogenic microorganism and is often made up of weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body’s immune system to recognize the agent as a threat, to destroy it, and to further recognize and destroy any microorganisms associated with that agent it may encounter in the future. The so-called vaccines can be prophylactic (to prevent or enhance the effects of a future infection by a natural or “wild” pathogen), or therapeutic (to combat a certain disease that has already occurred, such as cancer). Some vaccines offer complete sterilizing immunity, in which dangerous infection is prevented completely.
[ https://www.igorbnews.com/2021/10/canada-new-vaccine-requirements-for.html https://d26toa8f6ahusa.cloudfront.net/wp-content/uploads/2021/07/30214746/a-quiet-place-part-2-bigs-16.pdf