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When considering the virulence and spread of disease in the past, it is also important to remember that many epidemics were traced to standing armies. For example, the Spanish Flu first struck in the Spanish Army and it first appeared at a military training base in the Southern US. That is the same influenza outbreak that killed an estimated 21 million people before and during WWI. The spread of infectious disease has also been linked to communal living quarters, such as monasteries or at least it has been theorized that these were some of the hardest hit.There were also in the past many slave labor camps, which were used to for construction of monumental builiding projects, a favored pass-time of vain emperors and dictators the world over. These slave labor locations cannot have been all that sanitary. Taxation was always increased to squeeze the populations for funds for building projects.

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