Quarantine

Ancient Roots

  • The root comes from the Latin quadraginta, meaning forty.
  • In medieval Italian, this became quaranta (forty).

Venice and the Black Death

  • In the mid-14th century, the Black Death devastated Europe, killing around a third of the population.
  • Venice, a major port city, was terrified of infected ships bringing plague.
  • Authorities ordered ships from plague-affected regions to remain anchored offshore for a period before anyone could come ashore.

At first, this waiting period was trentino 30 days. Later, it was extended to 40 days for greater safety. This became known as quaranta giorni (“forty days”), which gave us quarantine.

Why Forty Days?

Historians believe the number 40 wasn’t random:

  • In the Bible, 40 days is a symbolic period of purification (e.g., Noah’s flood lasted 40 days, Jesus fasted for 40 days).
  • Medieval medicine often used 40 as a standard healing or cleansing period.
  • It was long enough to ensure plague symptoms would show in sailors and passengers.

Spread of the Word

  • By the 16th century, the term entered French as quarantaine.
  • English borrowed it in the early 17th century, first used for ships, later extended to people and even animals.
  • Over time, “quarantine” evolved to mean any enforced isolation to prevent the spread of disease, not just the 40-day rule.

Modern Usage

  • Today, quarantine can mean staying isolated due to infectious disease exposure, but also has figurative uses (e.g., quarantining computer viruses).
  • The original sense of “forty days” has faded, though the symbolic number is still remembered in the etymology.

Historical Impact

  • Quarantine laws were among the first public health measures in history.
  • Venice even built the Lazzaretto Vecchio (1423), one of the first quarantine stations, on an island in its lagoon.
  • The practice spread across Europe and shaped how governments handled epidemics up to modern times (including COVID-19).

So, the word “quarantine” is not just about isolation; it carries with it a whole story of fear, religion, trade, and the beginnings of public health.