Assertion: nonparalytic polio | /r/HasSubevent | back pain
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Source sentences:
text: Nonparalytic polio (abortive polio) can lead to flu-like symptoms that last for a few days , weeks, or months, such as sore throat, fever, fatigue, meningitis, muscles spasms, muscle tenderness, headache, arm and leg stiffness, neck and back pain, and vomiting.