Background In the US, community circulation of the SARS-CoV-2 virus likely began in February 2020 after mostly travel-related cases. Children’s Hospital of Philadelphia began testing on 3/9/2020 for pediatric and adult patients, and for all admitted patients on 4/1/2020, allowing an early glimpse into the local molecular epidemiology of the virus. Methods We obtained 169 SARS-CoV-2 samples (83 from patients
Summary Using sequencing and a novel technique for quantifying SARS-CoV-2 diversity, we investigated 169 SARS-CoV-2 genomes (83