- The original use of the word Quarantine was the act of anchoring a ship arrived in Venice, Italy, for 40 days before landing.
- Infectiousness of any disease is measured by the reproduction number (R0, or R naught). For example, Smallpox has an R0 of 6 whereas Measles has an R0 of 16.
- Vaccination, if available, and herd immunity can curb the spread of disease.
- Big cities, with exploding population and traffic, can lead to the rapid spread of any infectious disease.
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