...N/a, yet!
Buddha
well, Buddhism spread through a process intimately connected to trade routes that evolved over time also spread through maritime routes
it spread because of the trade routes
Influenza and the common cold can be spread by air, among other routes.
Trains or Locomotive systems and routes and Steamboats built during the Industrial Revolution.
through trade routes
There is no "regular" virus in medical terms. Viruses have different modes of spread.
Black Death started in China, in mongol army camps. It spread via trade routes.
By blocking its primary trade routes
black death was spread by Yersinia pestis bacterium. Rats and fleas help to spread it even more.
Islam first spread along TRADE ROUTES since merchants could often bring the religion to places too far away to effectively conquer.
Land and water routes became the basis for transregional trade, communication, and exchange networks in the Eastern Hemisphere.