ALT US COVID-19 heat map dated 19 October 2026, produced by the Pandemic Mitigation Collaborative (PMC), using CDC wastewater data last updated 10 October. - Outbreaks: At least 44 US states and territories experiencing COVID-19 outbreaks. - Western US: Widespread very high activity, particularly California, Oregon, Washington and neighbouring states. - Southeast: Extensive high to very high activity across Florida, Georgia, Alabama and the Carolinas. - Northeast: Numerous high-activity areas, particularly along the Atlantic coast. - Midwest: Mixed activity, ranging from very low to very high. - Estimated infectious prevalence: Very low: below 0.9%; Low: 1.2%; Moderate: 2.0%; High: 2.9%; Very high: above 3.5%. - Trend: PMC reports an apparent secondary peak following upward CDC data revisions. - Map colours: Pale blue, green, orange, red and purple indicate increasing activity levels.

ALT Pandemic Mitigation Collaborative (PMC) National COVID-19 Estimates for the United States, dated 19 October 2026, showing modelled infections, Long COVID cases and excess deaths. - Actively infectious: 1 in 57 Americans (1.7%). - New daily infections: 858,000. - Infections in the past week: 6.16 million. - Total infections in 2026: 151 million. - Cumulative infections per person: 5.61. - Estimated Long COVID cases from daily infections: 43,000–172,000. - Estimated Long COVID cases from weekly infections: 308,000–1.23 million. - Estimated excess deaths resulting from daily infections: 210–370. - Estimated excess deaths resulting from weekly infections: 1,500–2,600. All figures are PMC model estimates, not confirmed case counts. Source: PMC COVID-19 Model, pmc19.com, 19 October 2026.

ALT Pandemic Mitigation Collaborative (PMC) COVID-19 State Prevalence Estimates, 19 October 2026, showing estimated infectious prevalence and transmission risk across 25 US states and territories. - Highest prevalence: Mississippi 6.3% (1 in 16), Florida 5.2% (1 in 19), Hawaii 4.8% (1 in 21) and California 4.7% (1 in 21). - Other high estimates: Georgia 3.9%, Connecticut 3.6%, Maryland 3.5%, Guam 4.3%, Kentucky 3.3% and Delaware 3.2%. - Lowest prevalence: Arizona and Minnesota 0.5%, Michigan 0.8%, Indiana 0.8%, Illinois and Iowa 0.9%. - Room transmission risk: In Mississippi, estimated probability of at least one infectious person is 48% in a room of 10, 81% in 25, 96% in 50 and over 99% in 100. - CDC classifications: Standard and revised levels shown side by side. - Note: CDC categories were revised downwards in August 2026. Some states have limited data. All figures are model estimates, not confirmed infections.

ALT Pandemic Mitigation Collaborative (PMC) COVID-19 State Prevalence Estimates, 19 October 2026, showing estimated infectious prevalence and transmission risk across 27 US states and territories. - Highest prevalence: Oregon 6.7% (1 in 15), Washington 6.0% (1 in 17), US Virgin Islands 5.3% (1 in 19) and Puerto Rico 4.8% (1 in 21). - Other high estimates: Tennessee 4.4%, Montana and South Carolina 3.6%, North Carolina 3.1% and New Jersey 2.8%. - Lowest prevalence: New York, Ohio and Wyoming 0.5%, Oklahoma 0.5% and West Virginia 0.6%. - Room transmission risk: In Oregon, estimated probability of at least one infectious person is 50% in a room of 10, 82% in 25, 97% in 50 and over 99% in 100. - CDC classifications: Standard and revised levels shown side by side. - Note: CDC categories were revised downwards in August 2026. Some states have limited reporting. All figures are model estimates, not confirmed infections.