In this case, patient zero was a teacher:
"Grand Traverse County Health Officer Wendy Trute said last week that a teacher fell ill with whooping cough in October. Some of the teacher's close contacts did not take the antibiotic until they started to show symptoms, which is too late to prevent the disease's spread, Trute said."
The spread of the disease was exacerbated by the fact that this was a charter school, which accepted students from across district lines, and those exposed kids then went home and exposed more kids in their neighborhoods outside the district in which the charter school was located.
Perhaps mandatory vaccinations for teachers traveling abroad, so that they don't bring the disease back with them from their trip, and give it to their students?
You can't have a patient 1 without a patient zero...