They don’t test for Delta, so how do they know it’s Delta?
How can I tell if I have the Delta variant? Do labs report that to the state?
That information may not be readily available. The viral tests that are used to determine if a person has COVID-19 are not designed to tell you what variant is causing the infection. Detecting the Delta variant, or other variants, requires a special type of testing called genomic sequencing. Due to the volume of COVID-19 cases, sequencing is not performed on all viral samples. However, because the Delta variant now accounts for the majority of COVID-19 cases in the United States, there is a strong likelihood that a positive test result indicates infection with the Delta variant.
https://www.dshs.texas.gov/coronavirus/variant-faqs.aspx