no rumors of sickened workers. in fact she was planning to return in early 2020. >> you need to know the symptoms of that particular pathogen that you work with. and if you experience any of those symptoms, they need to be reported. >> she spoke to us from australia where she now works at the doherty institute in melbourne. >> with bsl 4 in particular, every day we have to take our temperature and our blood pressure. and it's recorded in a logbook. also at wiv, which is not go that's done everywhere, before i ever stepped foot in the lab i went to the hospital, had a blood sample taken, and that was stored. >> dr. anderson worked on ebola and nipa virus in wiv's bsl 4 labs and she attests to the high standards at that specific level. but again, it's not the bsl 4 that concerns dr. barak. it's coronavirus being worked on at lower biosafety level conditions like bsl 2.