Talk:Number needed to vaccinate

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NNV

NNV should be 1/ARR not 1/prevalence. — Preceding unsigned comment added by 216.164.63.114 (talk) 01:15, 9 October 2014 (UTC)[reply]

"derivation" wrong?

you say: "Derivation: NNV is the statistical inverse of incidence i.e. 1/incidence. In other words, in case of the vaccination for a disease with incidence of 1 per 1000, the NNV is 1000." this seems to ignore the herd-immunity-percentage coming into play to prevent a case. if an epidemic breaks down at 65 % of the population being immune it seems to follow that the NNV to prevent one 'incidence' is 650. right or wrong?

and how can it be explained that supposedly the NNV for one vaccine is lower than for another? is it because you vaccinate more people if the success-rate of a vaccination is not one or 100 %? so if in a given case the herd-immunity-rate is 50 %, but the vaccine-efficacy is also only 50 %, you would vaccinate 1000 with the incidence being 1/1000. HilmarHansWerner (talk) 15:01, 18 December 2021 (UTC)[reply]

I made this correction; I hope I have not added new errors. JBritnell (talk) 11:07, 28 August 2022 (UTC)[reply]