acquired immunity is the type of immunity that results indirectly to an individual from a vaccination or infection of others around them.
acquired immunity is the type of immunity that results indirectly to an individual from a vaccination or infection of others around them.
the type of immunity that results indirectly to an individual from a vaccination or infection of others around them?
acquired immunity
Na
Na
the term "herd immunity" was first used in 1923 to refer to an entire population's immunity, in reference to research examining disease mortality in mouse populations with varying degrees of immunity. herd immunity was first recognized as a naturally occurring phenomenon in the 1930s when a. w. hedrich published research on the epidemiology of measles in baltimore and took notice that after many children had become immune to measles, the number of new infections temporarily decreased, including among susceptible children. in spite of this knowledge, efforts to control and eliminate measles were unsuccessful until mass vaccination using the measles vaccine began in the 1960s. mass vaccination, discussions of disease eradication, and cost–benefit analyses of vaccination subsequently prompted more widespread use of the term "herd immunity". in the 1970s, the theorem used to calculated a disease's herd immunity threshold was developed. during the smallpox eradication campaign in the 1960s and 1970s, the practice of "ring vaccination", of which herd immunity is integral to, began as a way to immunize every person in a "ring" around an infected individual to prevent outbreaks from spreading.
herd immunity