Not necessarily it is dangerous, this much shows that he is having some kind of infection which needs to investigate further. Unless he have some grave symptoms or details one cannot predict medical hazards.
Next Steps
Go for detail blood investigation and Chest x-ray for better understanding.
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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