Wikipedia says Caliciviridae Family. My notes say that Norovirus includes the following
- Norwalk-like viruses
- Astroviruses and some small gastroenteroviruses
which is a larger definition including at least two families than the Wikipedia definition. I think
- Caliciviruses $\subset$ Caliciviridae
- Astroviruses and some small gastroenteroviruses $\subset$ astroviridae
so the note is taking subsets among different families and classifying them into abstract class called Noroviruses.
Extension based by Chris' excellent answer.
Criteria of Noroviruses
- (+)sense ssRNA viruses
- Structure and replication:
- 1) only (+)sense ssRNA,
- 2) simple nucleocapsid viruses,
- 3) only viruses transmitted by fecal-oral route,
- 4) size about 30 nm in diameter.
and then final classification of Noroviruses by these criteria
- Noroviruses $\subset$ Norwalk-like viruses ($\subset$ F. Caliciviruses)
- Some Astroviruses ($\subset$ F. astroviridae) and some small gastroenteroviruses (what?)
which, however, does not make sense since Caliciviridae $\not\subset$ Astroviridae. I do not understand what is the point of referring to the viruses by the sentence
Astroviruses and some other round/small gastroenteris viruses
which are not part of Astroviridae.
Which viruses of Caliciviridae are similar to Astroviruses that are apparently round and small gastroenteritis viruses?