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Hi and thanks for the query.
Most of the times the upper respiratory tract infections are viral but they do present with high grade fever at their onset. The most concerning thing here is the yellow mucus which is signifying a concomitant lower respiratory tract infection as well. Anyone above 60 years of age with productive cough and symptoms of low grade fever, lethargy, loss of appetite and nausea should be evaluated for lower respiratory tract infections like pneumonia.
I would suggest that you have this seen and examined by your PCP, a chest examination, chest xray and examination of the nose and throat needs to be done. The sputum needs to be expectorated and sent for a culture to identify the causative organism and you will require antibiotics for this. Mean while, you should start on steam inhalations thrice or four times a day with menthol crystals for 15 minutes each session and cough the sputum out. A nasal decongestant spray available OTC will alleviate the sinus congestion and bed rest and plenty of water for hydration.
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