For land border crossing to the USA there are currently no tests required. For air entry to USA every US non-resident needs to be fully vaccinated and in addition to this needs to have a valid COVID-19 test done within 1 day of travel. There are several test types allowed: both RT-PCR test and our rapid viral antigen test are accepted. We recommend rapid antigen test since it is equally valid but less pricey. Some passengers prefer to pay the extra cost for the PCR and it will work for them as well. Our rapid viral antigen test certificate signed by USA and Canada licensed physician will be satisfy covid-19 requirements at the USA border. More about tests for US entry in reference from CDC here.