Highly contagious, even in low concentrations, the viruses spread efficiently from feces and vomit by direct contact or by indirect transmission from viral contamination of surfaces.
From the sciencedaily.com
The thriller follows the rapid progress of a lethal indirect contact transmission virus that kills within days.
From the en.wikipedia.org
Consuming food products and fluid which have been contaminated by contact with an infecting organism is another case of disease transmission by indirect contact.