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 2:33 CDPH releases updated Covid-19 isolation guidelines 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:17 San Diego and California's COVID-19 Emergency Declarations Are Expiring. Here's What That Means 2:30 San Diego and California COVID-19 Emergency Declarations Expire Tuesday 3:26 COVID, Flu Cases Down Slightly; Doctors Urge Caution