Table 1.

R₀ values and corresponding herd immunity threshold values of infectious diseases (5, 6, 13, 14).

S. no.	Infectious diseases	R0 value	Herd immunity threshold
1	Small pox	5–7	80–85%
2	Mumps	4–7	75–86%
3	Measles	12–18	92–94%
4	Diphtheria	6–7	85%
5	Pertussis	12–17	92–94%
6	Polio	4–13	75–92%
7	Rubella	6–7	83–85%
8	H1N1 (2009 Pandemic)	1.6	40%
9	SARS	2–4	50–75%
10	SARS-CoV-2 (COVID-19)	5.7	82.5%