#Covid vaccine production schedule full

It was also the first disease for which a vaccine was produced. The first recorded use of inoculation to prevent smallpox occurred in the 16th century in China, with the earliest hints of the practice in China coming during the 10th century. The World Health Organization (WHO) reports that licensed vaccines are currently available for twenty-five different preventable infections.

Vaccination is the most effective method of preventing infectious diseases widespread immunity due to vaccination is largely responsible for the worldwide eradication of smallpox and the restriction of diseases such as polio, measles, and tetanus from much of the world. The administration of vaccines is called vaccination.

#Covid vaccine production schedule full

Some vaccines offer full sterilizing immunity, in which infection is prevented completely. Vaccines can be prophylactic (to prevent or ameliorate the effects of a future infection by a natural or 'wild' pathogen), or therapeutic (to fight a disease that has already occurred, such as cancer). The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The safety and effectiveness of vaccines has been widely studied and verified.

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease.