Regardless of the accuracy (or lack thereof) I think these sites could be useful for getting an idea about how people, especially peasants, who couldn't retreat to their summer houses dealt with the Black Death, as well as some "Cures" for it
http://www.historylearningsite.co.uk/black_death_of_1348_to_1350.htm
http://www.historylearningsite.co.uk/cures_for_the_black_death.htm