I've recently done some research on my computer, and came up with a scientific experiment done to correlate ABO antibody connections to specific norovirus strains. They tested 14 different strains of norovirus' responceto A,B,Ab, O and non-secretors and found that for most of them, they strongly connected to a certain antibody secretion. For example, the norwalk strain tested (the original strain found in Norwalk, OH) strongly attached and reproduced on people with type O, A, AB, however, didn't attach at all to people with antibody B and nonsecretors. Hence, there is now proof that different strains are attracted to certain people with a specific antibody in their blood. Some are strongly attracted to type O, others to type B or A, ect. Out of all 14 strains they tested, they found that by a small amount type B blood was least susceptable to the virus in general. But my question is this: Are different strains of norovirus, in general, to some degree symptomatically different? For example, whats refered to as "the norwalk strain" of norovirus caused most people to have precipitate vomiting, but many people who get a norovirus infectionin general dont necessarily experience precipitate v*, but may experience a ton of diarhea and little v*. I'm aware that a lot of a persons symptomatic responce deals with their own immune system, however, I'm talking in general about probable symptomatic experiences due to specific strains that belong in the norovirus family. So could the norwalk strain be prone to cause precipitate v*? While another strain could be prone to cause heavier diarhea and less v*?
Also, could the specific norwalk strain of norovirus, for example, mutate so that this strain now infects type B, and nonsecretors, but not type O?
Thanks a ton!