ORIGINAL AIRDATE: May 8th, 1989 ---
PTSD drives an acquaintance of MacGyver's to steal anthrax from a Phoenix Foundation lab
MISSION: MacGyver must track down an old friend with a dangerous strain of Anthrax before it ends up in the wrong hands.
This week's highlights include:

Anthrax (Bacteria)

Anthrax is an infection caused by the bacterium Bacillus anthracis. It can occur in four forms: skin, inhalation, intestinal, and injection. Symptoms begin between one day and two months after contracting the infection. The skin form presents with a small blister with surrounding swelling that often turns into a painless ulcer with a black center. The inhalation form presents with fever, chest pain, and shortness of breath. The intestinal form presents with nausea, vomiting, diarrhea, or abdominal pain. The injection form presents with fever and an abscess at the site of drug injection.

Check out the article on wikipedia: https://en.wikipedia.org/wiki/Anthrax.

Watch S4E18: "Renegade" on CBS's website or check the alternative streamability of this episode here.