Overlapping Delta and Omicron Outbreaks During the COVID-19 Pandemic: Dynamic Panel Data Estimates

Alexander L Lundberg   ^{1, 2} , PhD ;   Ramon Lorenzo-Redondo   ^{3, 4} , PhD ;   Judd F Hultquist   ^{3, 4} , PhD ;   Claudia A Hawkins   ^{3, 5} , MD ;   Egon A Ozer   ^{3, 4} , MD, PhD ;   Sarah B Welch   ^{1, 2} , MPH ;   P V Vara Prasad   ⁶ , PhD ;   Chad J Achenbach   ^{3, 7} , MD, PhD ;   Janine I White   ¹ , MSc ;   James F Oehmke   ¹ , PhD ;   Robert L Murphy   ^{3, 7} , MD ;   Robert J Havey   ^{7, 8} , MD ;   Lori A Post   ^{1, 2} , PhD

¹ Buehler Center for Health Policy and Economics, Robert J Havey, MD Institute for Global Health, Northwestern University, Chicago, IL, United States

² Department of Emergency Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States

³ Department of Medicine, Division of Infectious Diseases, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States

⁴ Center for Pathogen Genomics and Microbial Evolution, Robert J Havey, MD Institute for Global Health, Northwestern University, Chicago, IL, United States

⁵ Center for Global Communicable and Emerging Infectious Diseases, Robert J Havey, MD Institute for Global Health, Northwestern University, Chicago, IL, United States

⁶ Sustainable Intensification Innovation Lab, Kansas State University, Manhattan, KS, United States

⁷ Robert J Havey, MD Institute for Global Health, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States

⁸ Department of Medicine, General Internal Medicine and Geriatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States