We start with a catch-up on the latest US numbers. California rolls back reopening and LA and SD schools announce no in-person classes. Wal-Mart joins a growing list of retailers requiring face masks.  Are we making progress on “politicizing” face masks? A very extensive seroprevalence study out of Spain looked at over 60,000 people. Ben is excited by this demographic catnip, including implications for infection among children and the amount of asymptomatic cases. A recent study did autopsies on COVID-19 patients to assess the role of immune-mediated, rather than pathogenmediated, organ inflammation and injury. We discuss the latest on potential use of human challenge trials. Please subscribe on Apple, Spotify  or via RSS Feed, or search “Nate Duncan” in your podcast player. If you want to support this ad-free show please join Nate’s Patreon, Patreon.com/DuncanLeroux. With Nate Duncan (@NateDuncanNBA) and Ben Taylor (@ElGee35). Articles and studies cited on the show Walmart to Require Face Masks in All U.S. Stores Starting July 20 Covid-19 Cases Jump in Sunbelt Nursing Homes CDC: Covid-19 death toll is twice as high among people of color under age 65 as for white Americans Coronavirus Surge in Tulsa ‘More Than Likely’ Linked to Trump Rally A Profile of Older Americans: 2017 Serial Laboratory Testing for SARS-CoV-2 Infection Among Incarcerated and Detained Persons in a Correctional and Detention Facility — Louisiana, April–May 2020 | MMWR Doctors explain why mutated strain of coronavirus that is dominant in Houston is more contagious but not more deadly What To Look For In A Face Mask, According To Science The implications of silent transmission for the control of COVID-19 outbreaks Prevalence of SARS-CoV-2 in Spain (ENE-COVID): a nationwide, population-based seroepidemiological study Humoral immune response and prolonged PCR positivity in a cohort of 1343 SARS-CoV 2 patients in the New York City region Tissue-specific tolerance in fatal Covid-19 FDA official casts doubt on 'challenge trials' for Covid-19 vaccine Support the show: http://patreon.com/DuncanLeroux