CNN Health: One hospital had 9 flu cases at this time last year. This year, it has more than 1,400 At Ochsner Health System, the largest nonprofit health system in Louisiana, there were 6,909 cases of the flu in November — that’s 1,385% more cases than what it saw in November 2018. In fact, in the past 10 flu seasons, there have never been this many places with the highest level of flu activity at this time of year.