How was Marchionne's account similar to that of Boccaccio's?

Marchionne's is a politician in 1370's he gave an account of an incidence that happened in florence. Ot waa an outbreak of disease that took virtually everyone in a particular house hold lives. If an individual is struck with a disease any one who cared for such person will also contract the disease and the death is within four days. He gave the account of this terrible happening when Bocaccio's also gave the same report of the event of the

Disease incidence in florence after some time, which gives more evidence to Marchionne's report.