sick patients either here at home or in west africa. >> reporter: hickox is the first patient quarantined after new york city dr. craig spencer tested positive for ebola. health officials say they've now visited and cleared every place spencer went to before his confirmed diagnosis. cbs medical correspondent dr. jon lapook spoke to new york city's health commissioner, dr. mary bassett. >> reporter: you can imagine people are understandably concerned. maybe he should have been quarantined for 21 days. >> he did not have symptoms at that time. he had not yet had a fever, and when he had a fever, he absolutely immediately notified the public health authorities, and all the right actions were taken after that. and his temperature was not that high. he didn't say, "let me wait and see if it goes up." he measured the temperature of 100.3 and he picked up the phone. >> reporter: kaci hickox ends her article by saying, "we need more health care workers to help