Two dozen Boston Latin School students who may have been in close contact with that student are being urged to visit their own doctors this weekend, BPS confirms.
Some of those students may have to take a preventative course of antibiotics. Additional families were also notified.
In patients past infancy, the disease is rarely fatal, although it can mean weeks of persistent coughing.
Although young children are supposed to be vaccinated against the bacterial infection, the vaccine can wear off - and some parents refuse to let their children be vaccinated.