Endogenous interferon in Argentine hemorrhagic fever

Area of Science:

• Virology
• Immunology
• Infectious Diseases

Background:

• Argentine hemorrhagic fever (AHF) is a severe systemic illness caused by the Junin virus.
• Early administration of immune plasma can reduce AHF mortality.
• The role of endogenous interferon in AHF pathogenesis requires further investigation.

Purpose of the Study:

• To investigate the induction of endogenous interferon (IFN) in patients with Argentine hemorrhagic fever (AHF).
• To characterize the type of endogenous IFN involved in AHF.
• To explore the relationship between IFN levels and clinical manifestations.

Main Methods:

• Serum samples were collected daily from 28 AHF patients during the acute phase, before and after immune plasma treatment.
• Interferon titers were quantified.
• Antiviral activity was assessed for stability at pH 2 and neutralization by anti-IFN-alpha antibodies.

Main Results:

• High titers of circulating endogenous interferon were detected in AHF patients before immune plasma treatment.
• IFN titers significantly decreased after immune plasma transfusion.
• The antiviral activity was identified as typical interferon-alpha (IFN-alpha).
• Higher IFN levels correlated with fever, chills, and backache.
• IFN activity showed an inverse correlation with disease duration.

Conclusions:

• Circulating endogenous interferon in AHF patients is primarily IFN-alpha.
• Immune plasma treatment leads to a rapid drop in IFN-alpha levels.
• IFN-alpha may play a role in the clinical presentation of AHF.