Quarantine was originally introduced as a protection against:
In 14th century, quarantine was introduced in Europe to protect against transmission of plague. Ships, crews, travellers were detained for a 40 day period. Also remember, list of Quarantinable diseases are: Diphtheria Infectious tuberculosis Plague Small pox Yellow fever SARS Viral hemorrhagic fever Cholera Flu
Plague
Tuberculosis
AIDS
Malaria
International health agencies