If you have the antigen test made by Abbot, the sensitivity can be as high as 90% but false negative is much higher with tests made in China. However, if you are truly infected with covid-19 with the exposure 9 days ago, you are now almost free from covid symptoms so covid or other viral illness is almost the same. There is nothing to worry. I ain't sure why you are given anti-allergic med though.
Answered 3/3/2023
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