Whooping cough due to Bordatella pertussis with pneumonia:

Why should you never download or transfer public domain software, files from electronic bulletin boards, or other communication systems in the medical office?

If bone marrow cells have not been destroyed by exposure to ionizing radiation, they can

a. become insensitive to future exposures from ionizing radiation. b. overpopulate and become radioresistant. c. remain in circulating blood indefinitely. d. repopulate after a period of recovery.