Just when we thought we had the teaching of the causes of the Black Death licked along comes Prof Nils Stenseth, from the University of Oslo.
He and his colleagues then simulated disease outbreaks in nine cities, creating three models where the disease was spread by:
- airborne transmission
- fleas and lice that live on humans and their clothes
In seven out of the nine cities studied, the “human parasite model” was a much better match for the pattern of the outbreak.
It mirrored how quickly it spread and how many people it affected.
“The conclusion was very clear,” said Prof Stenseth. “The lice model fits best.”
“It would be unlikely to spread as fast as it did if it was transmitted by rats.
“It would have to go through this extra loop of the rats, rather than being spread from person to person.”