You thought you were over the hump. The fever broke, the chills subsided, and you were finally ready to rejoin the living. Then, seemingly out of nowhere, you feel worse than before. This isn’t just bad luck; it is a specific biological phenomenon known as a “secondary infection.” While your immune system was busy fighting off the initial virus, opportunistic bacteria decided to set up camp in your vulnerable lungs or sinuses. Recognizing the shift from a standard viral annoyance to a bacterial threat is critical because antibiotics only work on the latter. Here are the 5 vital signs that your winter sickness has mutated into something that requires a doctor’s intervention immediately.
