Coronavirus News LIVE Updates: US Scientists Developing Nasal Spray to Prevent Covid-19; More Than 2,500 US Virus Deaths in 24 Hours

Coronavirus News LIVE Updates: Scientists at the University of Pennsylvania and the biotech firm Regeneron are investigating whether technology developed for gene therapy can be used to make a nasal spray that will prevent infection with the new coronavirus. Coronavirus News LIVE Updates: US Scientists Developing Nasal Spray to Prevent Covid-19; More Than 2,500 US Virus Deaths in 24 Hours