Last I checked the US was sequencing about 1% of patients. In the Houston Methodist hospital system, they sequenced the viral genomes of 56% of patients, which

Last I checked the US was sequencing about 1% of patients. In the Houston Methodist hospital system, they sequenced the viral genomes of 56% of patients, which they estimate is about 4% of Covid cases in the Houston metropolitan area: https://www.sciencedirect.com/science/article/pii/S0002944021001085?casa_token=EYnNDjVpZvIAAAAA:KegleuW54WrHpikaUl1bIhceK5v3HCLjWlhLs9lztwbz8X69IjP_6NJsWs1BE9HomEF8-Fm2kVQl https://www.sciencedirect.com/science/article/pii/S000294402... Of course, there is a sampling bias there for variants that result in hospitalizations. Variant-specific proportions can be found here: https://covid.cdc.gov/covid-data-tracker/?ACSTrackingID=USCDC_2146-DM60904&ACSTrackingLabel=Laboratory%20Advisory%3A%20SARS-CoV-2%20Variants%20AY.1%20and%20AY.2%20Now%20Aggregated%20with%20Delta%20Variant%20B.1.617.2&deliveryName=USCDC_2146-DM60904#variant-proportions https://covid.cdc.gov/covid-data-tracker/?ACSTrackingID=USCD...