Does anyone know when, in a general sense, a norovirus vaccine will be available?

Thank you. I know that a norovirus vaccine would likely be a yearly thing, much like the flu vaccine, needing to be updated to include new strands, and I have read that immunity to a certain strand of norovirus only lasts a little over a year (though I have read conflicting studies). Of course I wouldn't let hopes of a vaccine substitute for basic hygiene and precautions, but a vaccine could really curb the spread of the virus and really shrink its footprint, much like Polio (also a viral infection spread via the fecal-oral route. The development of a vaccine has virtually eliminated the threat of Polio) - also, Noroviruses do mutate, but their mutations are relatively small compared with those of influenza.

Yes, a vaccine is not a "cure," but it could be a very helpful preventative measure in addition to hygiene. Conscientious people can wash their hands and sanitize surfaces all day long, but they can't control the actions of those who "don't care" - so personal preventative measures can only go so far.