immunity –n. the ability to keep from being infected by a disease

contagious –adj. able to spread from person to person easily

fleeting –adj. lasting only a short time

swab –n. materials used to collect something from the body for medical tests

diagnose –v. to recognize a disease or illness in someone through medial methods

symptom –n. a change in the body that shows that a disease is present

encouraging –adj. giving hope that things will get better