S: WHO – https://www.who.int/publications-detail/considerations-for-quarantine-of-individuals-in-the-context-of-containment-for-coronavirus-disease-(covid-19) (last access: 15 May 2020); ECDC – https://www.ecdc.europa.eu/sites/default/files/documents/COVID-19-resources-for-contact-tracing-2-March-2020_0.pdf (last access: 15 May 2020).
N: 1. As a noun: 1660s, “period a ship suspected of carrying disease is kept in isolation,” from Italian quaranta giorni, literally “space of forty days,” from quaranta “forty,” from Latin quadraginta“forty,” which is related to quattuor “four” (from PIE root *kwetwer- “four”). So called from the Venetian policy (first enforced in 1377) of keeping ships from plague-stricken countries waiting off its port for 40 days to assure that no latent cases were aboard. Also see “lazaretto”. The extended sense of “any period of forced isolation” is from 1670s.
Earlier in English the word meant “period of 40 days in which a widow has the right to remain in her dead husband’s house” (1520s), and, as quarentyne (15c.), “desert in which Christ fasted for 40 days,” from Latin quadraginta “forty.”
As a verb: 1804, from quarantine (n.). Related: Quarantined; quarantining.
2. Quarantine, the separation and restriction of travel of humans or other animals that may have come into contact with an infectious disease. Individuals remain under quarantine until it is deemed certain that they are free of infection. In the vocabulary of disease control, the terms quarantine and isolation are used interchangeably. In the strictest sense, however, isolation is the separation of a sick individual from healthy individuals.
3. Quarantine means staying in a specific designated location (i.e., home) away from others for the purpose of observing and monitoring your health status for the development of symptoms.
4. Not to be confused with isolation (a preventive measure against the spread of a contagious disease involving the separation of an infected person from non-infected people during the communicable period of the disease) and lockdown (an emergency protocol intended to limit the movement of a person for a variety of reasons, such as public health or public safety).
5. Phraseology: mandatory quarantine.
S: 1. OED – https://www.etymonline.com/word/quarantine (last access: 15 May 2020). 2. EncBrit – https://www.britannica.com/science/quarantine-preventive-medicine (last access: 15 May 2020). 3 to 5. TERMIUM PLUS – https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=quarantine&index=alt&codom2nd_wet=1#resultrecs; https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=isolation&index=alt&codom2nd_wet=1#resultrecs; https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=lockdown&index=alt&codom2nd_wet=1#resultrecs (last access: 15 May 2020).