. >> mark lyons, we'll talk later. thank you >>> the center for disease control issued guide lines for health professionals dealing with ebola patients, the changes after intense criticism to the initial response to ebola. heidi zhou-castro is in dallas covering the story. what is the latest? >> those guide lines are being trained in hospitals around the country. they follow three guiding principals, including rigorous and repeated training for health care workers putting on and taking off the protective equipment. no more skin exposure. this is a change compared to the hospital in dallas treating thomas eric duncan, where workers at first wore a face mask and goggles. that is no more. shields and respirator are required. and a trained monitor is recommended by the c.d.c. to watch each worker as they take off or put on, to catch missteps and fix on the spot. dallas is ground zero, really for the new training and measures to be implemented. a bit of good news for dallas. where we saw 44 people cleared of a risk after a