Definitive diagnosis of Viral Hemorrhagic Fever rests on __.

• A. IgM antibodies
• B. Specific virologic diagnosis
• C. Serology for hemorrhagic fever
• D. Clinical symptoms

Answer: (B)

The key idea is that confirming a Viral Hemorrhagic Fever requires identifying the virus itself, not just the body’s response or the symptoms. Definitive diagnosis comes from specific virologic testing that detects the virus or its genetic material in patient samples—such as RT-PCR to detect viral RNA, direct detection of viral antigens, or virus isolation in culture. These methods prove an active infection because they demonstrate the presence of the actual pathogen.

Serology and antibody tests can support the diagnosis but aren’t definitive on their own. IgM indicates recent infection but may appear late, vary by virus, or yield false positives; broad “hemorrhagic fever” serology can’t distinguish which virus is responsible. Clinical symptoms are important for suspicion and initial management but are nonspecific, as many illnesses can mimic VHFs. Therefore, the definitive confirmation rests on virologic identification of the virus.