COVID-19 jumped the species barrier via zoonotic transmission from bats through an intermediate host
Current scientific literature supports the consensus that COVID-19 emerged through zoonotic transmission, originating from bat reservoirs and utilizing intermediate hosts to adapt for human infection.
The retrieved papers consistently support the premise that SARS-CoV-2 is of zoonotic origin, linking bats as natural reservoirs and discussing intermediate host adaptation mechanisms. None of the papers refute this transmission pathway. Therefore, the balance of evidence clearly supports the claim.
Yuyi Huang, Junmou Xie, Yuhe Guo, Weimin Sun, Ying He, Kequn Liu, Jie Yan, Ailin Tao, Nanshan Zhong. SARS-CoV-2: Origin, Intermediate Host and Allergenicity Features and Hypotheses. 2021. https://doi.org/10.3390/healthcare9091132
Paper 1 suggests rodents or other wildlife acted as intermediate reservoirs based on genetic and phylogenetic alignments.
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Havens JL, Kosakovsky Pond SL, Zehr JD, Pekar JE, Parker E, Worobey M, Andersen KG, Wertheim JO. Dynamics of natural selection preceding human viral epidemics and pandemics.. 2026. https://doi.org/10.1016/j.cell.2026.02.006
Paper 2 finds evidence of natural selection occurring in an intermediate host prior to human emergence.
Xiaoqiang Huang, Chengxin Zhang, Robin Pearce, Gilbert S. Omenn, Yang Zhang. Identifying zoonotic origin of SARS-CoV-2 by modeling the binding affinity between Spike receptor-binding domain and host ACE2. 2020. https://doi.org/10.1101/2020.09.11.293449
Paper 4 uses modeling of binding affinities to identify potential mammalian intermediate hosts susceptible to SARS-CoV-2.
Verma M, Maan HS, Konatam S, Verma Y, Kumar R, Chaurasia D, Dave L, Sharma S. Geographical and Ecological Drivers of Zoonotic Viral Spillover: A Review of Emerging and Re-emerging Outbreaks.. 2025. https://doi.org/10.7759/cureus.99820
Paper 8 discusses how zoonotic viruses cross species barriers via intermediate carriers and environmental contact.
Usserbayev B, Zhugunissov K, Smekenov I, Akmyrzayev N, Abdykalyk A, Abeuov K, Zhumadil B, Melisbek A, Shirinbekov M, Zhaksylyk S, Nagymzhanova Z, Seidakhmetova A, Beltramo C, Peletto S, Kerimbaev A, Nurabaev S, Chervyakova O, Kozhabergenov N. Alpha- and Beta-Coronaviruses in Humans and Animals: Taxonomy, Reservoirs, Hosts, and Interspecies Transmission.. 2025. https://doi.org/10.3390/microorganisms14010043
Paper 9 emphasizes that identifying natural reservoirs and intermediate hosts is crucial for understanding the interspecies transmission of coronaviruses.
Petrovan A, Puiu L, Pop CM. COVID-19, the disease that changed the world.. 2026. https://doi.org/10.15386/mpr-2957
Paper 11 notes that the discovery of the virus in bats and other wildlife indicates a zoonotic origin involving wildlife hosts.
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