An order comprising three families of eukaryotic viruses possessing linear, nonsegmented, positive sense RNA genomes. The families are CORONAVIRIDAE; ARTERIVIRIDAE; and RONIVIRIDAE.
Infections with viruses of the order NIDOVIRALES. The concept includes ARTERIVIRUS INFECTIONS and CORONAVIRIDAE INFECTIONS.
The type species of the genus ARTERIVIRUS and the etiologic agent of an important equine respiratory disease causing abortion, pneumonia, or other infections.
A genus of the family CORONAVIRIDAE characterized by enveloped, peplomer-bearing particles containing an elongated tubular nucleocapsid with helical symmetry. Toroviruses have been found in association with enteric infections in horses (Berne virus), cattle (Breda virus), swine, and humans. Transmission probably takes place via the fecal-oral route.