The Food and Drug Administration confirmed Wednesday that the bacteria found at the Johnson & Johnson plant that produced the recalled children's medicines was Burkholderia cepacia, a bacteria often resistant to common antibiotics. The Centers for Disease Control and Prevention said B. cepacia poses little medical risk to healthy people. However, those with certain health problems like weakened immune systems or chronic lung diseases, particularly cystic fibrosis, may be more susceptible to infections with B. cepacia.