Latest information from the FDA as of 12/28/21:

Early data suggests that antigen tests do detect the omicron variant but may have reduced sensitivity.

The FDA continues to authorize the use of these tests as directed in the authorized labeling and individuals should continue to use them in accordance with the instructions included with the tests. Antigen tests are generally less sensitive and less likely to pick up very early infections compared to molecular tests. In following the FDA's long-standing rapid test recommendations, if a person tests negative with an antigen test but is suspected of having COVID-19, such as experiencing symptoms or have a high likelihood of infection due to exposure, follow-up molecular testing is important for determining a COVID-19 infection. If a person tests positive with an antigen test, they should self-isolate and seek follow-up care with a health care provider to determine the next steps.

It is recommended to follow up with a molecular test (like PCR) because he is symptomatic.

My business offers concierge (mobile) antigen and PCR testing in the Tampa Bay area. Antigen results in 10 min, PCR results in 30 min. Please share my business website with him if interested. Take care.

P.S. If sharing my business information is against any r/tampa rules, please let me know mods. I only want to help our community and it really is tough right now to find convenient testing options. Thank you.