File:HERD IMMUNITY AND COVID-19 VACCINES.jpg
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English: Diagram demonstrating spread of covid-19 infection with a basic reproduction number R0 = 4 (see Table 1 below). A- Spread of covid-19 over 3 generations after introduction into a fully susceptible population (1 case can lead to 4 cases and then to 16 cases and so on). B-Expected transmissions of covid-19 if (R0 - 1)/R0 = 1 - 1/R0 = 3/4 of the population is immune. Under such circumstance (achieved through vaccination or natural immunity), all except 1 of the contacts for each case is immune, hence in this circumstances one case will leads to only 1 successful transmission of the infection. This will lead to constant incidence over time. If a greater proportion of the population is immune to covid-19, then the incidence will decrease. On this calculation and basis, (R0 - 1)/R0 is known as the herd immunity threshold. |
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| Source | Own work |
| Author | Drpiyush003 |
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| current | 11:32, 19 December 2021 | | 1,224 × 1,584 (138 KB) | Drpiyush003 (talk | contribs) | Cross-wiki upload from en.wikiversity.org |
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