It was believed to be rats but know has found to be the fleas on the rats sucking blood and then transmitting the disease into the victims blood stream
No one did it was rats that carried black death (plague)
the black death was carried by fleas that were on rats and the rats were on boats and they were carried over
Fleas on the backs of rats carried the black death.
The Black Death was spread by fleas which lived on black rats.
it was carried by rats which caught the disease from parasites
Was carried by fleas.
It was carried by the fleas that lived on the rats.
The black death was carried by the oriental rat flea which then was past onto the rats then humans
Rattus rattus They were carried by the wild Black Rat.
The flea was a parasite on a black rat which carried the disease
It's because the rats that carried the fleas that carried the disease did not get to that place, because the rats that carried the Black Death rode on trading ships, and people did not trade with people from everywhere, but only in certain places.
By fleas which were carried around by rats.