only if the health authority acting in good faith has, based upon personal observation, its own epidemiological investigation or an epidemiological investigation by another health authority, a physician, a physician assistant licensed pursuant to chapter 630 or 633 of NRS or a registered nurse as stated in a certificate submitted pursuant to NRS 441A.570, if such a certificate was submitted, of the person or group of persons alleged to have been infected with or exposed to a communicable disease, a reasonable factual and medical basis to believe that the person or group of persons has been infected with or exposed to a communicable disease, and that because of the risks of that disease, the person or group of persons is likely to be an immediate threat to the health of members of the public who have not been infected with or exposed to the communicable disease.
NRS 441A.560