Rethinking quarantine rules

In a pandemic, quarantines are an important tool in controlling the spread of disease. The practice originated in Venice in the 14century to protect the city from the plague epidemic if the ship came from infected ports. The term is derived from the Italian wordswhich means 40 days which is how long the ships stayed at sea before docking at port.

But why base the categories solely on incidence rates and case counts? We are not admitting entire populations but individual travelers. There is a bias in this thinking since many countries in the green list actually may not be testing enough to land in the yellow or red category. It prejudices countries with high testing rates which of course will detect more cases thus landing them in the yellow category even if a majority of their populations are fully/partially vaccinated.

Why not base quarantine restrictions on incoming travelers’ vaccination status? Fully vaccinated persons are very much less likely to be infected. Even if infected, they have lower viral loads and therefore will not pass it on to others. The delta variant has put a damper on the last item with some researchers claiming breakthrough infections still have high viral loads . Nonetheless, breakthrough infections are uncommon thus, the risks are lower with vaccinated persons overall.

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