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An upper respiratory infection is contagious for as long as the active virus is in your system. Taking an antibiotic will help rid the body of the live virus. You will remain contagious for 24 hours following the first treatment of the antibiotic.

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11y ago

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How long is a dog contagious with upper respiratory infection?

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How long you remain contagious after suffering an infectious illness depends on the illness you've caught. Expand your question to specify the infection you need to know about, or check with your doctor or health clinic.


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