Heartland virus (HRTV) (HRTV)

Heartland virus (HRTV) is an emerging tick-borne pathogen in the family Phenuiviridae, primarily transmitted by the Lone Star tick (Amblyomma americanum) in the United States. It possesses a tri-segmented, negative-sense RNA genome that encodes several proteins, including an RNA-dependent RNA polymerase, glycoproteins, and a non-structural protein (NSs). HRTV causes Heartland virus disease, a severe febrile illness characterized by fever, fatigue, thrombocytopenia, and leukopenia, often requiring hospitalization and potentially leading to multi-organ failure. The viral NSs protein acts as a critical virulence factor by antagonizing host innate immunity, specifically by blocking the TBK1-IRF3 interaction and inhibiting STAT-mediated interferon signaling. There are currently no FDA-approved vaccines or specific antiviral therapies, making management primarily supportive. Recent preclinical research has identified the viral RNA polymerase as a key therapeutic target, with nucleoside analogs like 4'-fluorouridine (EIDD-2749) showing significant efficacy in mouse models. Other experimental agents, such as favipiravir and the antifungal anidulafungin, have also demonstrated inhibitory activity against the virus in laboratory settings.

Other names

HRTVHeartland bandavirusBandavirus heartlandenseHeartland phlebovirus

Inhibition of viral RNA-dependent RNA polymerase and interference with viral entry/fusion mechanisms.