A study has recently revealed that the rapid expansion of the Roman Empire in the 1st century CE assisted the spread of tuberculosis around the world. The disease is first evidence in humans in Africa around 3000 BCE. But the spread out of Africa, of four of seven investigated genetic strains of TB, occurred during the 1st century CE. Just at the time that the Roman Empire conquered the Mediterranean basin.
The out-of-Africa spread of TB is thought to have been aided by the expanding Roman’s new transportation links – those wonderful Roman roads – as well as increased movement and exploration around the Mediterranean.