Weakened viruses and bacteria “can multiply too much and might cause disease” in people whose immune systems do not work.
The measles, mumps and rubella (MMR) vaccine is a type of live vaccine used in the UK.
In addition to live vaccines, there are some other forms of vaccines like inactivated vaccines.
Inactivated vaccines use the killed version of a virus or bacteria.
The Vaccine Knowledge Project add: “Because inactivated vaccines do not contain any live bacteria or viruses, they cannot cause the diseases against which they protect, even in people with severely weakened immune systems.
“However, inactivated vaccines do not always create such a strong or long-lasting immune response as live vaccines.”
Many vaccines in development to fight Covid-19 are neither live or inactivated vaccines, and are instead messenger RNA vaccines.
Published at Thu, 17 Dec 2020 22:57:00 +0000