My 16yr old son has lost his sense of smell but has no other symptoms. is this covid?

Yes: The presentation of COVID 19 may be subtle and includes this symptom. Monitor temperature and watch for flu like symptoms. Rise nasal passages with saline. A test is recommended, and please isolate until without symptoms/test negative and no fever for three days, whichever is longer.

Possibly: Suspicion for COVID 19 is higher if you have at least 2 of these symptoms: temp of at least 99.6 F (37.5 C), Cough, Shortness of breath, Chills, Shivering, Muscle pain, Headache, Sore throat or new loss of taste or smell.

See below: Covid-19: https://www.cdc.gov/coronavirus/2019-ncov/index.html Contact your doctor/local hospital, by phone for evaluation and testing in your area. Wear a mask, stay away from others, practice hand hygiene. If you develop breathing difficulty, go to the nearest hospital, immediately. Get Covid vaccine. Wish you good health.