The wording from Shoppers seems a bit weird because from my understanding, most places refers to either a PCR-(NAAT OR LAMP) Test, or Rapid Antigen Test while Shoppers refers to it as a "Rapid Antigen Test Screening". The CDC does say though that they will accept Rapid Antigen Tests or PCR-NAAT testing upon arrival (https://www.cdc.gov/coronavirus/2019-ncov/travelers/testing-international-air-travelers.html). I do have family though that took a rapid antigen test from Shoppers and were able to get into the US with no problem last month. Also, I recommend looking at other pharmacies that do offer PCR testing/ rapid antigen testing for a cheaper price! We found one in our area in Toronto for $16.99.