Lockdown 1800: the yellow fever epidemic in Alcalá
As we approach week 6 of confinement in an effort to stop the spread of a deadly virus, it seems timely to take a look at another virus that devastated the population of Alcalá over two hundred years ago, killing over a fifth of the population. Information on that epidemic comes from an article in Spanish by Ismael Almagro Montes de Oca on his blog Historia de Alcalá de los Gazules . Yellow fever is spread when a mosquito feeds on blood from an infected person and transfers the virus to its next meal. However at the time of the 1800 epidemic in Spain contagious diseases were believed to originate in "miasmas", toxic vapours emanating from decaying matter, then passed directly from one human to another. Viruses were not identified until the late 19th century, the first vaccines arrived soon after, and the discovery of the role of the mosquito in propagating yellow fever was made in 1900. Symptoms of yellow fever start to appear within about five days. These include feve