Go to the doctor...and get a prescription. My son got it two weeks ago, and it can be diagnosed within about 10 seconds, some doctors will give you a prescription over the phone for Polymyxin, and about 5 minutes later you are golden (highly contagious but takes about 24 hours until you are no longer infectious)...
It costs us a $15 copay, and $9.81 for the medicine. This is also something you can go to one of those clinics at a pharmacy , drug store, or grocery store and get treated in less than 15 minutes...even without insurance I think it is $30 for one of those walk-in clinics.
The only upside is that the strain can only live off a host for a maximum of an hour...so it isn't like you have to disinfect everything you own.
Over the counter meds will not work.