The vaccine is therefore a safe and clever way to produce an immune response in the body, without causing illness. Our immune systems are designed to remember. Once exposed to one or more doses of a vaccine, we typically remain protected against a disease for years, decades or even a lifetime.
This is what makes vaccines so effective. This article is part of a series of explainers on vaccine development and distribution. Learn more about vaccines – from how they work and how they’re made to ensuring safety and equitable access – in WHO’s Vaccines Explained series. Vaccines reduce risks of getting a disease by working with your body’s natural defenses to build protection.
define vaccine, When you get a vaccine, your immune system responds. We now have vaccines to prevent more than 30 life-threatening diseases and infections, helping people of all ages live longer, healthier lives. Before any vaccine is introduced in a country, the vaccine undergoes rigorous and stringent testing through multiple phases of clinical trials. Health authorities carefully evaluate the results of these trials to help ensure that the vaccine meets the highest safety and efficacy standards before being considered suitable for use. Vaccines are available to prevent more than 20 life-threatening diseases, helping people live longer, healthier lives.
define vaccine, They reduce risks of getting a disease by working with your body’s natural defenses to build protection. When you get a vaccine, your immune system responds. Vaccine protection and timing Vaccines work by building strong protection against disease. Some vaccines require only one dose to build protection, while others need multiple doses spaced apart – called the primary series – to develop full protection. Summary WHO SAGE conclusions and recommendations on Vaccine Hesitancy Vaccine hesitancy is a complex and rapidly changing global problem that requires ongoing monitoring. WHO definition of vaccine hesitancy: Vaccine hesitancy refers to delay in acceptance or refusal of vaccines despite availability of vaccination services.
Vaccine hesitancy is an increasingly important issue for country immunization programmes,” says Dr Philippe Duclos, Senior Health Adviser for WHO’s Immunization, Vaccines and Biological Department and guest editor of the special issue, entitled WHO recommendations regarding vaccine hesitancy.
