introducing small quantities of dead or inactive forms of pathogens
What is a key fact of vaccination?
since the pathogen is dead/inactive it cannot lead to a disease
What do the white blood cells do when when the person is vaccinated ?
they stimulate to produce antibodies against the dead/inactive pathogen,also the white blood cells divides by mitosis to produce lots of copies of itself
What happens to the copies of the white blood cells ?
they can stay in the blood for decades ,so if the same pathogen enter the body many years late the whit blood cells can produce the correct antibodies quickly
What is heard immunity ?
when a large part of the population of an area is immune to a specific disease
