Neges e-bost rhwng Richard Pengelly (DoH, GI), Michael McBride (DoH, GI), David Gordon (DoH, GI), yr Athro Ian Young (DoH, GI) a chydweithwyr, ynghylch Modelu cwrs yr epidemig COVID ac effaith gwahanol ymyriadau ac argymhellion, rhwng 10/10/2020 a 11/10/2020