coronavirus April 30, 2020 3:32 pm Dogs Being Trained to Sniff Out COVID-19 Researchers at the University of Pennsylvania Vet School are studying whether dogs can use their keen sense of smell to identify COVID-19 patients. US & World Videos 2:19 San Francisco barbershop struggles to stay open after pandemic 0:51 Alameda County using dogs to detect COVID 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:27 Marking 4 years since COVID-19 shut down the Bay Area 2:09 CDC updates COVID isolation guidelines