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Global Translational Medicine Immune response in humans due to COVID-19 infection
pH. This mechanism renders the Omicron endosomal Consent for publication
entry route temperature-sensitive, enabling more
effective operation in the upper respiratory tract than Not applicable.
the lung parenchyma, in contrast to the temperature- Availability of data
insensitive TMPRSS2 pathway. As Omicron infection
63
predominantly affects the upper respiratory tract, it Not applicable.
reduces the pathogenicity of SARS-CoV-2 at this stage
of the pandemic by limiting viral dissemination to other References
essential organs. However, despite decreased virulence, 1. Tan CW, Chia WN, Zhu F, et al. SARS-CoV-2 Omicron
Omicron remains highly transmissible. Reportedly, variant emerged under immune selection. Nat Microbiol.
64
Omicron replication in the bronchi is 70 times higher than 2022;7(11):1756-1761.
that of the Delta variant. It is hypothesized that increased doi: 10.1038/s41564-022-01246-1
viral replication in conducting airways might result in 2. Hou Y, Zhao J, Martin W, et al. New insights into genetic
increased viral shedding during speaking or breathing susceptibility of COVID-19: An ACE2 and TMPRSS2
through the nose and oral passageways, playing a major polymorphism analysis. BMC Med. 2020;18(1):216.
role in the airborne transmission of SARS-CoV-2. 61
doi: 10.1186/s12916-020-01673-z
5. Conclusion 3. Bakhshandeh B, Jahanafrooz Z, Abbasi A, et al. Mutations
The evolutionary interplay of viral variants has extensively in SARS-CoV-2; Consequences in structure, function, and
modified the development of corresponding immune pathogenicity of the virus. Microb Pathog. 2021;154:104831.
responses in humans since the onset of the pandemic. doi: 10.1016/j.micpath.2021.104831
Accumulating mutations and hypervariability in spike 4. Mouliou DS, Gourgoulianis KI. COVID-19
proteins during initial waves were associated with increased ‘asymptomatic’patients: An old wives’ tale. Expert Rev Respir
virulence and infectivity. However, as the pandemic Med. 2022;16(4):399-407.
progressed, the increasing mutations tended to decrease doi: 10.1080/17476348.2022.2030224
pathogenicity while compensating with significantly
high transmissibility. This shift has enabled the human 5. Boyton RJ, Altmann DM. The immunology of asymptomatic
population to better manage severe clinical manifestations SARS-CoV-2 infection: What are the key questions? Nat Rev
caused by SARS-CoV-2, leading to a normalization Immunol. 2021;21(12):762-768.
of social protocols globally that were disrupted by the doi: 10.1038/s41577-021-00631-x
pandemic. Therefore, a deep-rooted understanding of the 6. Huang Y, Yang C, Xu XF, Xu W, Liu SW. Structural and
evolutionary paradigms of both host and parasite systems functional properties of SARS-CoV-2 spike protein:
is significant for designing effective clinical measures that Potential antivirus drug development for COVID-19. Acta
address global health perspectives. Pharmacol Sin. 2020;41(9):1141-1149.
Acknowledgments doi: 10.1038/s41401-020-0485-4
None. 7. Williams H, Hutchinson D, Stone H. Watching brief: The
evolution and impact of COVID-19 variants B.1.1.7, B.1.351,
Funding P.1 and B.1.617. Glob Biosecur. 2021;3(1).
doi: 10.31646/gbio.112
None.
8. Huang C, Wang Y, Li X, et al. Clinical features of patients
Conflict of interest infected with 2019 novel coronavirus in Wuhan, China.
Lancet. 2020;395(10223):497-506.
The authors declare no conflicts of interest.
doi: 10.1016/S0140-6736(20)30183-5
Author contributions 9. Acharya D, Liu G, Gack MU. Dysregulation of type I
Conceptualization: Chayan Munshi interferon responses in COVID-19. Nat Rev Immunol.
Writing – original draft: Mihieka Bose 2020;20(7):397-398.
Writing – review & editing: All authors doi: 10.1038/s41577-020-0346-x
Ethics approval and consent to participate 10. Hsu JCC, Laurent-Rolle M, Pawlak JB, Wilen CB, Cresswell P.
Translational shutdown and evasion of the innate immune
Not applicable. response by SARS-CoV-2 NSP14 protein. Proc Natl Acad Sci
Volume 3 Issue 1 (2024) 7 https://doi.org/10.36922/gtm.2228

