"Didn't the nasal spray stop working?"
It did, against this exact strain. From 2013 to 2016 the nasal vaccine barely protected kids against H1N1, and the CDC's vaccine committee told doctors not to use it for two seasons. The manufacturer rebuilt the H1N1 part and it returned in 2018.
Effectiveness changes from season to season for every flu vaccine, shot or spray. For kids, the rebuilt spray has held up well.
Adults: get the shot. In the head-to-head trial in healthy adults, the shot protected far better than the spray. Grown-ups already carry some flu immunity, which seems to blunt the live spray vaccine.



