Hi, I agree that the chances of getting it unless someone was sick right next to you are low, but there are documented cases of it infecting people in enclosed spaces where someone was ill a few feet away. I have found this piece of info from a californian article on dealing with noro in care facilities, on the web that says this:
Since norovirus can be aerosolized or suspended in air for an hour or more,
should rooms be left empty for a time after contamination with norovirus?
Although studies of FCV (and presumably norovirus) show that infectious particles may
remain in air for at least 120 minutes after aerosolization, transmission of “airborne”
norovirus probably occurs through swallowing of large aerosolized droplets rather than
inhalation of small droplet nuclei. These large particles may travel farther than 6 feet
with forceful vomiting, but are not known to circulate in the air.
However, observations of transmission to concert goers and to carpet layers from
environments known to have been contaminated with vomit many hours previously,
suggest that dust from dried vomit is infective and highlights the need for reliable
environmental decontamination of soft furnishings. If thorough cleaning and disinfection
is done, we see no need to leave rooms empty after cleaning and disinfection or to
repeat terminal cleaning. It may also be prudent to postpone dustproducing
activities such as buffing the floor for the duration of the outbreak. Vacuum cleaners should be equipped with high efficiency particulate air (HEPA) filters.
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