the specialty pharmacy that made the medication is recalling all of its products out of an abundance of caution. jonathan has more. even with the medication pulled, doctors say new cases of meningitis are most likely coming in. >> that's because of the long incubation period. typically people infected with the fungal meningitis will develop symptoms one to four weeks after exposure. but today, tennessee state health officials said that they have seen incubation periods ranging from six to 42 days. and some experts believe there may be rare instances where it could be a few months. so we're likely to see new cases through october and possibly into november or even beyond. this just in, some members of congress are asking the cdc and the f.d.a. for a briefing on this outbreak. >> shep: they're saying like 13,000 people got these shots. do they have a way to know how many of them they expect to actually get meningitis? >> hard to tell. this form of outbreak is