The “I’m Fine” Infection That Isn’t If you’ve ever had a cold that just won’t quit, two weeks of cough, on-and-off low fevers, chest tightness when you climb stairs, you might have met walking pneumonia. It’s not a formal diagnosis; it’s the everyday way people describe mild pneumonia, often from atypical bacteria like Mycoplasma pneumoniae. You can still go to class, practices, or meetings. But you shouldn’t. Because ...