Paul A Dabisch, Jaleal S Sanjak, Jeremy A Boydston, John Yeager, Artemas Herzog, Jennifer Biryukov, Katie Beck, Danh Do, Brittany G Seman, Brian Green, Jordan K Bohannon, Brian Holland, David Miller, Taylor Ammons, Denise Freeburger, Susan Miller, Tammy Jenkins, Sherry Rippeon, James Miller, David Clarke, Emmanuel Manan, Ashley Patty, Kim Rhodes, Tina Sweeney, Michael Winpigler, Louis A Altamura, Heather Zimmerman, Alec S Hail, Victoria Wahl, Michael Hevey
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引用次数: 0
Abstract
Background: As the COVID-19 pandemic has progressed, numerous variants of SARS-CoV-2 have arisen, with several displaying increased transmissibility. Methods: The present study compared dose-response relationships and disease presentation in nonhuman primates infected with aerosols containing an isolate of the Gamma variant of SARS-CoV-2 to the results of our previous study with the earlier WA-1 isolate of SARS-CoV-2. Results: Disease in Gamma-infected animals was mild, characterized by dose-dependent fever and oronasal shedding of virus. Differences were observed in shedding in the upper respiratory tract between Gamma- and WA-1-infected animals that have the potential to influence disease transmission. Specifically, the estimated median doses for shedding of viral RNA or infectious virus in nasal swabs were approximately 10-fold lower for the Gamma variant than the WA-1 isolate. Given that the median doses for fever were similar, this suggests that there is a greater difference between the median doses for viral shedding and fever for Gamma than for WA-1 and potentially an increased range of doses for Gamma over which asymptomatic shedding and disease transmission are possible. Conclusions: These results complement those of previous studies, which suggested that differences in exposure dose may help to explain the range of clinical disease presentations observed in individuals with COVID-19, highlighting the importance of public health measures designed to limit exposure dose, such as masking and social distancing. The dose-response data provided by this study are important to inform disease transmission and hazard modeling, as well as to inform dose selection in future studies examining the efficacy of therapeutics and vaccines in animal models of inhalational COVID-19.
期刊介绍:
Journal of Aerosol Medicine and Pulmonary Drug Delivery is the only peer-reviewed journal delivering innovative, authoritative coverage of the health effects of inhaled aerosols and delivery of drugs through the pulmonary system. The Journal is a forum for leading experts, addressing novel topics such as aerosolized chemotherapy, aerosolized vaccines, methods to determine toxicities, and delivery of aerosolized drugs in the intubated patient.
Journal of Aerosol Medicine and Pulmonary Drug Delivery coverage includes:
Pulmonary drug delivery
Airway reactivity and asthma treatment
Inhalation of particles and gases in the respiratory tract
Toxic effects of inhaled agents
Aerosols as tools for studying basic physiologic phenomena.