What is the definition of Improved Infection?

An 'improved infection' is like when a tiny, sneaky germ gets a superpower upgrade and starts spreading like wildfire, but instead of causing a mild inconvenience, it's turning your once-pristine self into a walking, talking biohazard with a wicked sense of humor.

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Now, here's an example that might just give you the chills: "After years of meticulous hand washing and wearing a ridiculously thick face mask (which I swear was the only thing that stopped this 'improved infection' from turning my nose into a pizza slice), my cat decided it was time to join the global outbreak and started leaving unsolicited 'petroleum jelly' on my windowsill, turning my window into a makeshift bio-lab."