case presentation this article presents a 56-year-old woman from guilan province, the north of iran and the southern coast of the caspian sea, who admitted to the hospital with acute fever, severe headache, thrombocytopenia, anemia, epigastric pain, myalgia, nausea and vomiting. conclusions we recognized that the case was co-infected by cchf and leptospirosis. introduction infectious diseases a...