Ill person means an individual who:
(1) Has a fever (a measured temperature of 100.4 °F [38 °C] or greater, or feels warm to the touch, or gives a history of feeling feverish) accompanied by one or more of the following: Skin rash, difficulty breathing, persistent cough, decreased consciousness or confusion of recent onset, new unexplained bruising or bleeding (without previous injury), persistent diarrhea, persistent vomiting (other than air sickness), headache with stiff neck, appears obviously unwell; or
(2) Has a fever that has persisted for more than 48 hours; or
(3) Has symptoms or other indications of communicable disease, as the CDC may announce through posting of a notice in the Federal Register.
42 CFR § 70.1
As used in this part, terms shall have the following meaning: