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The Difference Between Viral and Bacterial Infections

Understanding the symptoms and progression of viral and bacterial infections can help identify when supportive care or antibiotics may be needed.

Child with rash on their hand

Patrick Passarelli, MD

  • Viral and bacterial infections often share similar symptoms, making it difficult to distinguish between them without additional testing.
  • Viral infections commonly cause symptoms such as a runny nose, fever, and cough, similar to those experienced with the common cold.
  • Bacterial infections may cause more localized symptoms, including redness, swelling, or pus, and sometimes higher fevers.
  • A secondary bacterial infection may develop after a viral illness, particularly when symptoms initially improve but then worsen or a new fever develops.
  • Treatment differs depending on the infection. Viral infections typically require supportive care, including rest and hydration, while bacterial infections may require antibiotics.

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