From 1529 on, typhus was present in some degree at almost every major European conflict.

From The Illustrious Dead by Stephan Talty.  Page 109.

This described the situation all over the Continent. Before the war, typhus was a minor regional power in several pockets of Europe, especially the Balkans. Afterward, it was an empire.

In those it didn’t kill, Rickettsia prowazekii often lay dormant, occasionally flaring up in a mild condition known as Brill-Zinsser disease. This latent infection kept the pathogen alive, ready to pass from its host to a louse to fresh victims. If enough new hosts were available, the bacteria could spark a new epidemic—as was happening now in the Grande Armée.

From 1529 on, typhus was present in some degree at almost every major European conflict. It hamstrung armies and stopped offensives during the English Civil War (1642-51). It killed tens of thousands of soldiers during the War of the Austrian Succession (1740-48), and it would keep its potency into the Crimean War (1853-56), which pitted Russia against France, England, and the Ottoman Empire, where it wreaked havoc on the French army and killed hundreds of thousands of soldiers and civilians. 

 

The same agonizing symptoms that had attacked millions of Europeans for hundreds of years were being described in diary after diary of common soldiers and doctors marching toward Moscow. But Dr. Larrey and the upper reaches of the French military machine virtually ignored them as typhus swept through the ranks, killing wantonly. Now the cost was coming due.