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1. Changing social contact patterns among US workers during the COVID-19 pandemic: April 2020 to December 2021

Author

Moses C. Kiti, Obianuju G. Aguolu, Alana Zelaya, Holin Y. Chen, Noureen Ahmed, Jonathan Batross, Carol Y. Liu, Kristin N. Nelson, Samuel M. Jenness, Alessia Melegaro, Faruque Ahmed, Fauzia Malik, Saad B. Omer, and Ben A. Lopman

Subjects
Social contact patterns, Infectious disease transmission, Mathematical modeling, COVID-19, Infectious and parasitic diseases, RC109-216
Abstract

Non-pharmaceutical interventions minimize social contacts, hence the spread of respiratory pathogens such as influenza and SARS-CoV-2. Globally, there is a paucity of social contact data from the workforce. In this study, we quantified two-day contact patterns among USA employees. Contacts were defined as face-to-face conversations, involving physical touch or proximity to another individual and were collected using electronic self-kept diaries. Data were collected over 4 rounds from 2020 to 2021 during the COVID-19 pandemic. Mean (standard deviation) contacts reported by 1456 participants were 2.5 (2.5), 8.2 (7.1), 9.2 (7.1) and 10.1 (9.5) across round 1 (April–June 2020), 2 (November 2020–January 2021), 3 (June–August 2021), and 4 (November–December 2021), respectively. Between round 1 and 2, we report a 3-fold increase in the mean number of contacts reported per participant with no major increases from round 2–4. We then modeled SARS-CoV-2 transmission at home, work, and community settings. The model revealed reduced relative transmission in all settings in round 1. Subsequently, transmission increased at home and in the community but remained exceptionally low in work settings. To accurately parameterize models of infection transmission and control, we need empirical social contact data that capture human mixing behavior across time.

Published
2023
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2. Contributors

Author

Mark J. Abzug, Elisabeth E. Adderson, Allison L. Agwu, Kevin Alby, Grace M. Aldrovandi, Upton D. Allen, Gerardo Alvarez-Hernández, Krow Ampofo, Evan J. Anderson, Margot Anderson, Stella Antonara, Monica I. Ardura, Paul M. Arguin, John C. Arnold, Naomi E. Aronson, Ann M. Arvin, Shai Ashkenazi, Edwin J. Asturias, Vahe Badalyan, Carol J. Baker, Karthik Balakrishnan, Brittany S. Barros, William J. Barson, Daniel G. Bausch, Kirsten Bechtel, Daniel K. Benjamin, David M. Berman, David A. Blanco, Karen C. Bloch, Margaret J. Blythe, Joseph A. Bocchini, Anna Bowen, William R. Bowie, Thomas G. Boyce, John S. Bradley, Michael T. Brady, Denise F. Bratcher, Paula K. Braverman, Joseph Bresee, Itzhak Brook, Kevin E. Brown, Kristina Bryant, E. Stephen Buescher, Jane L. Burns, Carrie L. Byington, Andres F. Camacho-Gonzalez, Paul Cantey, Bryan D. Carter, Mary T. Caserta, Luis A. Castagnini, Chiara Cerini, Ellen Gould Chadwick, Silvia S. Chiang, John C. Christenson, Susan E. Coffin, Melissa G. Collier, Jennifer P. Collins, Laurie S. Conklin, Beverly L. Connelly, Despina Contopoulos-Ioannidis, James H. Conway, Margaret M. Cortese, Elaine G. Cox, C. Buddy Creech, Jonathan D. Crews, Dennis J. Cunningham, Nigel Curtis, Natalie J.M. Dailey, Lara A. Danziger-Isakov, Toni Darville, Gregory A. Dasch, Irini Daskalaki, Robert S. Daum, Michael Davenport, H. Dele Davies, Fatimah S. Dawood, J. Christopher Day, Maite de la Morena, Gail J. Demmler-Harrison, Gregory P. DeMuri, Dickson D. Despommier, Karen A. Diefenbach, Kathryn M. Edwards, Morven S. Edwards, Lawrence F. Eichenfield, Dirk M. Elston, Beth Emerson, Moshe Ephros, Guliz Erdem, Marina E. Eremeeva, Jessica E. Ericson, Douglas H. Esposito, Monica M. Farley, Anat R. Feingold, Kristina N. Feja, Adam Finn, Marc Fischer, Patricia M. Flynn, LeAnne M. Fox, Michael M. Frank, Douglas R. Fredrick, Robert W. Frenck, Sheila Fallon Friedlander, Hayley A. Gans, Gregory M. Gauthier, Jeffrey S. Gerber, Francis Gigliotti, Mark A. Gilger, Carol A. Glaser, Amanda F. Goddard, Benjamin D. Gold, Jane M. Gould, Michael Green, David Greenberg, Tanya Greywal, Daniel Griffin, Patricia M. Griffin, Alexei A. Grom, Kathleen Gutierrez, Julie Gutman, Judith A. Guzman-Cottrill, Aron J. Hall, Jin-Young Han, Marvin B. Harper, Julie R. Harris, Christopher J. Harrison, David B. Haslam, Sarah J. Hawkes, J. Owen Hendley, Marion C.W. Henry, Joseph A. Hilinski, Susan L. Hills, Scott D. Holmberg, Deborah Holtzman, David K. Hong, Peter J. Hotez, Katherine K. Hsu, David A. Hunstad, Loris Y. Hwang, Mary Anne Jackson, Richard F. Jacobs, Ravi Jhaveri, Kateřina Jirků-Pomajbíková, Jeffrey L. Jones, Mahima Karki, M. Gary Karlowicz, Ben Z. Katz, Ishminder Kaur, Gilbert J. Kersh, Jay S. Keystone, Muhammad Ali Khan, David W. Kimberlin, Martin B. Kleiman, Bruce S. Klein, Karl Klontz, Barbara Knust, Andrew Y. Koh, E. Kent Korgenski, Paul Krogstad, Preeta Krishnan Kutty, Christine T. Lauren, Hillary S. Lawrence, Amy Leber, Grace M. Lee, Eugene Leibovitz, Eyal Leshem, Stéphanie Levasseur, David B. Lewis, Robyn A. Livingston, Eloisa Llata, Sarah S. Long, Ben A. Lopman, Yalda C. Lucero, Jorge Luján-Zilbermann, Katherine Luzuriaga, Noni E. MacDonald, Yvonne A. Maldonado, John Manaloor, Chitra S. Mani, Kalpana Manthiram, Gary S. Marshall, Stacey W. Martin, Almea Matanock, Catalina Matiz, Alison C. Mawle, Tony Mazzulli, Kathleen A. McGann, Kenneth McIntosh, Lucy A. McNamara, Michal Meir, Debrah Meislich, H. Cody Meissner, Elissa Meites, Asunción Mejías, Jussi Mertsola, Kevin Messacar, Mohammed Nael Mhaissen, Marian G. Michaels, Melissa B. Miller, Eric D. Mintz, John F. Modlin, Parvathi Mohan, Susan P. Montgomery, José G. Montoya, Pedro L. Moro, Anna-Barbara Moscicki, R. Lawrence Moss, Angela L. Myers, Simon Nadel, Michael N. Neely, Karen P. Neil, Joanna Nelson, Noele P. Nelson, William L. Nicholson, Victor Nizet, Amy Jo Nopper, Theresa J. Ochoa, Walter A. Orenstein, Miguel O'Ryan, Christopher D. Paddock, Harpreet Pall, Suresh Kumar Panuganti, Diane E. Pappas, Robert F. Pass, Thomas F. Patterson, Monica E. Patton, Stephen I. Pelton, Brett W. Petersen, Larry K. Pickering, Swetha Pinninti, Paul J. Planet, Andrew J. Pollard, Klara M. Posfay-Barbe, Casper S. Poulsen, Susan M. Poutanen, Ann M. Powers, Charles G. Prober, Octavio Ramilo, Shawn J. Rangel, Suchitra Rao, Sarah A. Rawstron, Jennifer S. Read, Michael D. Reed, Ryan F. Relich, Megan E. Reller, Neil Rellosa, Katherine A. Rempe, Melissa A. Reyes, Samuel E. Rice-Townsend, Frank O. Richards, José R. Romero, David A. Rosen, Christina A. Rostad, G. Ingrid J.G. Rours, Janell A. Routh, Anne H. Rowley, Lorry G. Rubin, Edward T. Ryan, Lisa Saiman, Julia S. Sammons, Laura Sass, Jason B. Sauberan, Sarah Schillie, Grant S. Schulert, Jennifer E. Schuster, Kevin L. Schwartz, Bethany K. Sederdahl, Jose A. Serpa, Kara N. Shah, Samir S. Shah, Andi L. Shane, Eugene D. Shapiro, Jana Shaw, Avinash K. Shetty, Linda M. Dairiki, George Kelly Siberry, Jane D. Siegel, Robert David Siegel, Kari A. Simonsen, Nalini Singh, Upinder Singh, P. Brian Smith, John D. Snyder, Eunkyung Song, Jennifer L. Sorrell, Emily Souder, Joseph W. St. Geme, Mary Allen Staat, J. Erin Staples, Jeffrey R. Starke, William J. Steinbach, Christen R. Stensvold, Bradley P. Stoner, Raymond A. Strikas, Jonathan B. Strober, Paul K. Sue, Deanna A. Sutton, Douglas Swanson, Jacqueline E. Tate, Marc Tebruegge, Eyasu H. Teshale, Amelia B. Thompson, George R. Thompson, Robert Thompson-Stone, Richard B. Thomson, Emily A. Thorell, Nicole H. Tobin, Philip Toltzis, James Treat, Stephanie B. Troy, Russell B. Van, Louise Elaine Vaz, Jennifer Vodzak, Ellen R. Wald, Rebecca Wallihan, Zoon Wangu, Matthew Washam, Joshua R. Watson, Rachel L. Wattier, Geoffrey A. Weinberg, A. Clinton White, Harold C. Wiesenfeld, John V. Williams, Rodney E. Willoughby, Sarah L. Wingerter, Robert R. Wittler, Karen K. Wong, Kimberly A. Workowski, Terry W. Wright, Pablo Yagupsky, Catherine Yen, Jumi Yi, Jonathan S. Yoder, Edward J. Young, Andrea L. Zaenglein, and Kanecia Zimmerman

Published
2018
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3. List of Contributors

Author

Anna Bowen, Michael B. Batz, Julie A. Caswell, Amar G. Chittiboyina, Michael J. Dark, Maria Teresa Destro, Caroline Smith De Waal, Tarek F. El-Arabi, Teresa Estrada-Garcia, S. Fanning, Neal D. Fortin, A.A. Franco, Paul A. Gastañaduy, Kathleen Glass, G. Gopinath, Lynn Grattan, Patricia M. Griffin, Mansel W. Griffiths, Christopher J. Grim, Tine Hald, Aron J. Hall, Valerie J. Harwood, Arie Havelaar, Gail A. Hecht, Kim Hodges, Sailor Holobaugh, L. Hu, K.G. Jarvis, Melissa Jones, V.K. Juneja, Erik A. Karlsson, Stephanie M. Karst, Ikhlas A. Khan, Sabine Kienesberger, Martyn Kirk, Titia Kortbeek, M.H. Kothary, Ronald G. Labbé, Anna Lammerding, Mariza Landgraf, Richard H. Linton, Ben A. Lopman, Kristin Marshall, David Z. McSwane, J. Glenn Morris, Truls Nesbakken, Benjamin Nygren, Marieke Opsteegh, Renato H. Orsi, Ahmed Mohamed Galal Osman, Umesh D. Parashar, Guillermo Ignacio Perez-Perez, John I. Pitt, David Plunkett, Morris E. Potter, Jürgen A. Richt, Cynthia Roberts, Alfredo C. Rodriguez, V. Sathyamoorthy, Elaine Scallan, Stacey Schultz-Cherry, Umid M. Sharapov, B.D. Tall, Phillip I. Tarr, Eyasu H. Teshale, Joke van der Giessen, Jan Vinjé, Heather Stockdale Walden, Siyun Wang, Anita C. Wright, and Alan J. Young

Published
2013
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5. Contributors

Author

Elisabeth E. Adderson, Aarti Agarwal, Grace M. Aldrovandi, Upton D. Allen, Manuel R. Amieva, Krow Ampofo, Alicia D. Anderson, Margot Anderson, Paul M. Arguin, John C. Arnold, Ann M. Arvin, Shai Ashkenazi, Carol J. Baker, William J. Barson, Daniel G. Bausch, Kirsten Bechtel, Daniel K. Benjamin, Frank E. Berkowitz, Margaret J. Blythe, Joseph A. Bocchini, Michael Boeckh, Anna Bowen, William R. Bowie, Thomas G. Boyce, John S. Bradley, Michael T. Brady, Denise F. Bratcher, Paula K. Braverman, Caroline Breese Hall, Joseph S. Bresee, Itzhak Brook, Kristina Bryant, E. Stephen Buescher, Jane L. Burns, Gale R. Burstein, Carrie L. Byington, Kathy K. Byrd, Michael Cappello, Bryan D. Carter, Emily J. Cartwright, Mary T. Caserta, Chiara Cerini, Ellen Gould Chadwick, Beth Cheesebrough, P. Joan Chesney, John C. Christenson, Thomas G. Cleary, Susan E. Coffin, Laura M. Conklin, Laurie S. Conklin, Beverly L. Connelly, Despina Contopoulos-Ioannidis, James H. Conway, Margaret M. Cortese, C. Michael Cotten, Elaine Cox, Maryanne E. Crockett, James E. Crowe, Nigel Curtis, Dennis J. Cunningham, Linda Marie Dairiki Shortliffe, Toni Darville, Gregory A. Dasch, Irini Daskalaki, Robert S. Daum, Fatimah S. Dawood, Gail J. Demmler, Dickson D. Despommier, Karen A. Diefenbach, Christopher C. Dvorak, Kathryn M. Edwards, Morven S. Edwards, Lawrence F. Eichenfield, Dirk M. Elston, Janet A. Englund, Veronique Erard, Marina E. Eremeeva, Anat R. Feingold, Adam Finn, Anthony E. Fiore, Marc Fischer, Sarah J. Fitch, Patricia M. Flynn, LeAnne M. Fox, Michael M. Frank, Douglas R. Fredrick, Sheila Fallon Friedlander, Hayley A. Gans, Carla G. Garcia, Maria C. Garzon, Jeffrey S. Gerber, Michael D. Geschwind, Laura B. Gieraltowski, Francis Gigliotti, Peter H. Gilligan, Carol Glaser, Benjamin D. Gold, Brahm Goldstein, Jane M. Gould, Michael Green, David Greenberg, Patricia M. Griffin, Alexei A. Grom, Kathleen Gutierrez, Judith A. Guzman-Cottrill, Aron J. Hall, Marvin B. Harper, Christopher J. Harrison, David B. Haslam, Sarah J. Hawkes, Edward B. Hayes, Rohan Hazra, Sara Jane Heilig, J. Owen Hendley, Marion C.W. Henry, Joseph A. Hilinski, Scott D. Holmberg, Deborah Holtzman, Peter J. Hotez, Katherine K. Hsu, Dale J. Hu, Loris Y. Hwang, David Y. Hyun, Mary Anne Jackson, Richard F. Jacobs, Jeffrey L. Jones, Saleem Kamili, M. Gary Karlowicz, Ben Z. Katz, Gilbert J. Kersh, Laura M. Kester, Jay S. Keystone, David W. Kimberlin, Martin B. Kleiman, Mark W. Kline, Andrew Y. Koh, Andreas Konstantopoulos, Katalin I. Koranyi, E. Kent Korgenski, Andrew T. Kroger, Paul Krogstad, Christine T. Lauren, Hillary S. Lawrence, Eugene Leibovitz, Stéphanie Levasseur, David B. Lewis, Jay M. Lieberman, Jen-Jane Liu, Robyn A. Livingston, Eloisa Llata, Anagha R. Loharikar, Sarah S. Long, Ben A. Lopman, Bennett Lorber, Donald E. Low, Yalda C. Lucero, Jorge Luján-Zilbermann, Katherine Luzuriaga, Noni E. MacDonald, Adam MacNeil, Yvonne A. Maldonado, Chitra S. Mani, Mario J. Marcon, Gary S. Marshall, Stacey W. Martin, Catalina Matiz, Alison C. Mawle, Tony Mazzulli, George H. McCracken, Matthew B. McDonald, Robert S. McGregor, Kenneth McIntosh, Meredith McMorrow, Candice McNeil, Jennifer H. McQuiston, Debrah Meislich, H. Cody Meissner, Asunción Mejías, Manoj P. Menon, Jussi Mertsola, Marian G. Michaels, Melissa B. Miller, Eric D. Mintz, John F. Modlin, Parvathi Mohan, Susan P. Montgomery, Jose G. Montoya, Zack S. Moore, Maite de la Morena, Pedro L. Moro, Anna-Barbara Moscicki, R. Lawrence Moss, Trudy V. Murphy, Dennis L. Murray, Angela L. Myers, Simon Nadel, James P. Nataro, Michael N. Neely, William L. Nicholson, Victor Nizet, Amy Jo Nopper, Anna Norrby-Teglund, Theresa J. Ochoa, Miguel O’Ryan, Walter A. Orenstein, Christopher D. Paddock, Diane E. Pappas, Robert F. Pass, Thomas F. Patterson, Stephen I. Pelton, Larry K. Pickering, Caroline Diane Sarah Piggott, Philip A. Pizzo, Andrew J. Pollard, Klara M. Posfay-Barbe, Susan M. Poutanen, Dwight A. Powell, Alice S. Prince, Charles G. Prober, Octavio Ramilo, Shawn J. Rangel, Sarah A. Rawstron, Jennifer S. Read, Michael D. Reed, Joanna J. Regan, Megan E. Reller, Melissa A. Reyes, Peter A. Rice, Samuel E. Rice-Townsend, Frank O. Richards, Gail L. Rodgers, Pierre E. Rollin, José R. Romero, G. Ingrid J.G. Rours, Anne H. Rowley, Sharon L. Roy, Lorry G. Rubin, Guillermo M. Ruiz-Palacios, Lisa Saiman, Laura Sass, Jason B. Sauberan, Peter M. Schantz, Eileen Schneider, Gordon E. Schutze, Benjamin Schwartz, Heidi Schwarzwald, Kara N. Shah, Samir S. Shah, Andi L. Shane, Craig A. Shapiro, Eugene D. Shapiro, Umid M. Sharapov, Jana Shaw, George Kelly Siberry, Jane D. Siegel, Robert David Siegel, Nalini Singh, Upinder Singh, P. Brian Smith, John D. Snyder, David E. Soper, Mary Allen Staat, J. Erin Staples, Jeffrey R. Starke, William J. Steinbach, Ina Stephens, Joseph W. St. Geme, Bradley P. Stoner, Jonathan B. Strober, Kanta Subbarao, Deanna A. Sutton, Douglas Swanson, Leonel T. Takada, Jacqueline E. Tate, Robert V. Tauxe, Marc Tebruegge, Eyasu H. Teshale, George R. Thompson, Herbert A. Thompson, Richard B. Thomson, Emily A. Thorell, Rania A. Tohme, Robert W. Tolan, Philip Toltzis, James Treat, Stephanie B. Troy, Russell B. Van Dyke, Jorge J. Velarde, Jennifer Vodzak, Ellen R. Wald, Geoffrey A. Weinberg, A. Clinton White, Marc-Alain Widdowson, Harold C. Wiesenfeld, John V. Williams, Roxanne E. Williams, Rodney E. Willoughby, Craig M. Wilson, Sarah L. Wingerter, Jerry A. Winkelstein, Kimberly A. Workowski, Terry W. Wright, Pablo Yagupsky, Nada Yazigi, Catherine Yen, Edward J. Young, Andrea L. Zaenglein, and Theoklis E. Zaoutis

Published
2012
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6. Social contact patterns among employees in 3 U.S. companies during early phases of the COVID-19 pandemic, April to June 2020

Author

Moses C. Kiti, Obianuju G. Aguolu, Carol Y. Liu, Ana R. Mesa, Rachel Regina, Meaghan Woody, Kathryn Willebrand, Chandra Couzens, Tilman Bartelsmeyer, Kristin N. Nelson, Samuel Jenness, Steven Riley, Alessia Melegaro, Faruque Ahmed, Fauzia Malik, Ben A. Lopman, and Saad B. Omer

Subjects
Infectious diseases, Social contact surveys, Social mixing, Social contact patterns, Infectious and parasitic diseases, RC109-216
Abstract

We measured contact patterns using online diaries for 304 employees of 3 U.S. companies working remotely. The median number of daily contacts was 2 (IQR 1-4); majority were conversation (55 %), occurred at home (64 %) and lasted >4 h (38 %). These data are crucial for modeling outbreak control among the workforces.

Published
2021
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7. Fitting outbreak models to data from many small norovirus outbreaks

Author

Eamon B. O’Dea, Kim M. Pepin, Ben A. Lopman, and Claus O. Wilke

Subjects
Stochastic epidemic model, Parameter estimation, Norovirus, Health-care-associated infection, Generalized linear model, Infectious and parasitic diseases, RC109-216
Abstract

Infectious disease often occurs in small, independent outbreaks in populations with varying characteristics. Each outbreak by itself may provide too little information for accurate estimation of epidemic model parameters. Here we show that using standard stochastic epidemic models for each outbreak and allowing parameters to vary between outbreaks according to a linear predictor leads to a generalized linear model that accurately estimates parameters from many small and diverse outbreaks. By estimating initial growth rates in addition to transmission rates, we are able to characterize variation in numbers of initially susceptible individuals or contact patterns between outbreaks. With simulation, we find that the estimates are fairly robust to the data being collected at discrete intervals and imputation of about half of all infectious periods. We apply the method by fitting data from 75 norovirus outbreaks in health-care settings. Our baseline regression estimates are 0.0037 transmissions per infective-susceptible day, an initial growth rate of 0.27 transmissions per infective day, and a symptomatic period of 3.35 days. Outbreaks in long-term-care facilities had significantly higher transmission and initial growth rates than outbreaks in hospitals.

Published
2014
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