Already searched : “medieval illness/disease”, “medieval epidemics”, “epidemics”, etc + the various diseases that presented themselves during those searches but without much success for my specific set of requirements. So I turn to you lovely people for help ...
Setting : Medieval (late 12th century) - Middle east (present day Lebanon) in a big city along the coast
I need a disease which can hit my medieval middle eastern city and kill a portion of its inhabitants.
Here my various criterias :
The outbreaks starts in mid/late June, peaks in July and August and is mostly gone by the end of August with a few people still dying in early September.
I don't want to wipe them out. I just need something which would cause a significant number of person to die but leave enough people alive so that society doesn't crumble (let say a third/half the population gets it and about half / two thirds of the sick people die but I'm really not fussy with number, basically enough to be noticeable and worrying enough for people to leave the city and be scared of catching it but something from which they rebound easily enough without much consequences beside the loss of family members/friends.)