Aug 04 2021, 7:30 AM August 04 2021, 4:32 AM August 04 2021, 7:30 AM (Bloomberg) -- The spread of the delta coronavirus variant has pushed the threshold for herd immunity to well over 80% and potentially almost 90%, the Infectious Diseases Society of America said. (Bloomberg) -- The spread of the delta coronavirus variant has pushed the threshold for herd immunity to well over 80% and potentially almost 90%, the Infectious Diseases Society of America said. U.S. President Joe Biden criticized the pandemic response of the Florida and Texas governors, both Republicans. The two states account for about a third of all new U.S. cases in the past week. Thailand had record deaths and cases, while Australia found a case in the far-north city of Cairns. Hong Kong imposed a quarantine on arrivals from Macau and thereâs growing concern about a resurgence of the virus in mainland China, which has renewed many curbs and is discouraging unnecessary travel.