Table 1.

Basic reproduction numbers and implied crude HPT for various communicable diseases^13,19

Infections	R0	HPT (%)
Diphtheria	6–7	84–85
Influenza	2–4	50–75
Malaria	5–100	80–99
Measles	9–18	83–94
Mumps	4–14	75–93
Pertussis	5–35	90–94
Polio	2–4a, 8–14b	80–86 (controversial)
Rubella	6–7	83–86
Smallpox	5–7	80–85

^aPopulations with good hygiene.

^bPopulations with poor hygiene.

HPT: herd protection threshold; R₀: reproduction number.