Now that the WHO says H1N1 is in a post-pandemic period, the Health Department plans on ordering just one vaccine for both the regular flu and the swine flu this fall. But the WHO warns, "we expect the H1N1 virus to take on the behavior of a seasonal influenza virus and continue to circulate for some years to come." The vaccine received its fair share of controversy last year, with some parents refusing to vaccinate their kids, and others wondering why their kids didn't have the option of getting it in school. Overall, about 800,000 New Yorkers were vaccinated last season.