Mehdi Fazlalipour - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Vahid Baniasadi - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Mohammad Hassan Pouriayevali - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Tahmineh Jalali - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Tahereh Mohammadi - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Sanam Azad-Manjiri - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Yasaman Jamshidi - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Sara Azizizadeh - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Motahareh Hosseini - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Sahar Khakifirouz - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
Mostafa Salehi-Vaziri - Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran

[No Abstract] Crimean-Congo hemorrhagic fever (CCHF) is considered as the most important arboviral infection in Iran. Early diagnosis of CCHF is essential for preventing the spread of the infection and providing appropriate treatment to patients. Given that clinical symptoms of CCHF may overlap with other common infectious disease; differential diagnosis is a matter of great importance. In this report, we describe a case of rheumatoid arthritis intoxicated with methotrexate mimicking CCHF. This observation suggests that non-infectious medical conditions such as drug toxicity should be considered as a possible differential diagnosis of CCHF.

[No keywords] Crimean-Congo Hemorrhagic Fever, Differential Diagnosis, Methotrexate