Learn English: How Did Diseases Spread Across the Ocean? (normal)

Back in the days of sailing ships, it was very difficult for diseases to spread across oceans.

A new study used math to show that illnesses often died out on the ship itself before reaching new lands.

The study highlights how the invention of faster modes of transportation drastically changed how diseases spread.

Before modern travel, it was much harder for viruses to spread globally, leading to fewer epidemics.