Definition of herd immunity in US English:

herd immunity


  • The resistance to the spread of a contagious disease within a population that results if a sufficiently high proportion of individuals are immune to the disease, especially through vaccination.

    ‘the level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94 percent’
    • ‘This group may also have reduced herd immunity and generally produce lower quantity and quality of colostrum, resulting in greater risk of disease and potentially reduced production in their offspring.’
    • ‘Uncertainty about the level of herd immunity generated by vaccination programmes limits modelling of the potential benefits of booster vaccination.’
    • ‘The goal is herd immunity, where the proportion of people susceptible to infection in a physically interacting population is so low that transmission of infection is unlikely.’
    • ‘Because of the herd immunity that exists because of mass vaccination, the unvaccinated are also protected.’
    • ‘One correctly pointed out that if universal smallpox vaccination were offered, those who couldn't be immunized would be protected by herd immunity.’
    • ‘High immunisation rates may result in herd immunity, which increases protection for all residents, including the weakest patients.’
    • ‘There, public health officials have now documented mass HPV vaccination and the first glimmers of herd immunity.’
    • ‘Neither one really addressed the question of mandatory vaccination and its effect on mortality and herd immunity.’
    • ‘As adolescents are the only group in which carriage rates have been studied, these data provide more robust evidence of herd immunity across the whole population.’
    • ‘The vaccination is seen as a way to achieve herd immunity as it stops the spread of the illness from children to others that are vulnerable to flu.’
    • ‘They found no evidence that vaccination prevents viral transmission, putting the whole herd immunity myth once again into question.’
    • ‘A good herd immunity effect dramatically controlled the disease initially.’
    • ‘The level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94%.’
    • ‘The result has been outbreaks of measles - children have received ineffective injections leading to a breakdown in herd immunity.’
    • ‘Of course, the issue of herd immunity is further complicated by the amount of cross protection afforded by commercial vaccines, as no vaccine will contain every strain or every possible antigen.’
    • ‘Thus herd effect is a reflection of both herd immunity and the inhibitory effect of vaccine-induced immunity on the shedding of the pathogen necessary for new infections to occur.’
    • ‘The goal of measles control is to raise population immunity above herd immunity threshold and eventually to interrupt indigenous virus transmission.’
    • ‘Children whose parents opt not to vaccinate decrease herd immunity, which protects populations from communicable diseases.’