I don’t know, but last month three people in my family, including one who is on immuno blockers, caught swine flu from 2009 (verified by PCR) and did have cold-like symptoms, but no hospitalization or other complications and no longer than a week. We got it tested because one sick person is non verbal and has a history of pneumonia, so whenever she gets a bad cough I take her to have someone listen to her lungs and this time they opted to test for the strain. I kind of wish we could do that more often as it’s very interesting to know and see these things come around. They all had this year’s flu vaccine, which every year includes some h1n1 variant, as had everyone else in the house who didn’t get sick at all. So anecdotally and unscientifically, I would say Spanish flu is not a threat, especially if you’ve been getting flu vaccines every year.