"I don't think it's under control yet, per se. I think that they've done a good job, FDA has, isolating this to central Mexico and some specific farms as well," [former FDA commissioner Scott] Gottlieb told CBS News's Margaret Brennan during an appearance on "Face the Nation." He later added, "I don't think this is fully under control yet because we don't know for sure that that's the only growing region where this is coming from. But it does seem to be the case at this point."