High population density and commuting challenges amplify the spread of viruses like COVID-19.

“New York has a high density of people you've been there a bunch you know what New York is like compared to San Diego you can imagine that a virus that can spread basically by you breathing on somebody is much more likely in New York imagine you're sitting on the subway you have these people that have to commute in and out of Manhattan every day from these different boroughs so you just have a high population that's close together that has these commuting challenges where they're in close proximity to others”