infected with these bacteria. these are bugs we usually see for utis, for pneumonia, wound infections. martha: upper track infections. >> pneumonias, e.coli, bugs everybody is very familiar, they have become resistant to the last, the last antibiotics we have available. they get embedded in hospitals. they get transmitted from person-to-person. they make surgical challenges, i myself have been dealing with a patient now for a while with a resistant bug. it is really creating havoc. now why is it happening? i think a lot has to do with overcrowding hospital, number one. because right now the turnaround, occupancy in many hospitals is 100%. you don't have enough time to clean the beds and things of this sort. and also these, these bugs have evolved genetically. they have evolved perhaps because of overutilization of antibiotics in the past. so this is a big, big challenge. martha: who is most at risk