Americans appear to be taking the H1N1 flu more seriously than they did in the spring when the virus began causing widespread illness. The latest poll by USA Today shows that of the 1,007 adults surveyed, one in three believe they or a family member will probably contract H1N1, up from one in five in May. Sixty-one percent now accept the government’s assessment of the novel flu’s risks, up 5 percent since May, and the majority of people, 55 percent, say for the first time they will get vaccinated, up 9 percent.