ISIS is responsible for spreading flesh eating bug across Syria that causes Leishmaniasis.
The disesase is spreading after ISIS kills people and dump their bodies in the streets and open areas, reported the Daily Mail.
Around 500 cases of Leishmaniasis disease have been reported in Syria over the past 12 months.
The Leishmaniases are diseases caused by protozoan parasites from more than 20 Leishmania species that are transmitted to humans by the bites of infected female phlebotomine sandflies.
There are three main forms of the disease: cutaneous, visceral and mucocutaneous: cutaneous leishmaniasis, visceral leishmaniasis or kala-azar, and mucocutaneous leishmaniasis.
"As a result of abominable acts by ISIS that included the killing of innocent people and dumping their corpses in streets, this is the leading factor behind the rapid spread of Leishmaniasis disease," said Dilqash Isa of the Kurdish Red Crescent.
People living in Syria are not getting medical assistance as country's health service has collapsed as a result of the bitter civil war.
According to WHO around 13 million Syrians are in need of humanitarian assistance.