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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.Ear infection would not cause this level.The level can occur from congestion of chest.There can be bronchospasm in the lungs.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish his healthy life.Regards.