What is the definition of Hdsvax?

Hdsvax is like a high-tech, super-strong, and utterly baffling vaccination shot that's supposedly designed to protect against a whole host of diseases, but somehow, it ends up causing more health issues than the diseases it claims to prevent. Imagine this: "After getting the hdsvax, John suddenly started having migraines, acne, and decided he needed a new haircut, all while claiming it was just his body's way of saying 'This vaccine is a total bummer!'"