Your 5-year-old daughter has just come home from day care feeling poorly and not eating. The next day, she has vomiting, a rash, diarrhea, and some neurological symptoms. The diagnosis is bacterial meningitis, a contagious bacterial infection, usually not life-threatening. Within a week, she is up and about again, apparently healthy. The little boy who lives next door to you gets this same disease 3 months later, and you become worried that your daughter will again get meningitis. They play together all the time, and he could easily transmit the bacterium to her during play. Is this a potential problem?