Secondary infections by bacteria can be more dangerous than the original illness, such as when a viral respiratory infection leads to bacterial pneumonia. Others can be less dangerous, like a bacterial infection of the skin following an attack of scabies. If unexpected, severe, or prolonged symptoms arise from a previously diagnosed illness, or if a symptom that had cleared up (like fever) comes back, see your doctor. If it is a secondary bacterial infection it likely can be treated with antibiotics.
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