Comparative Analysis of 2022 Outbreak MPXV and Previous Clade II MPXV
Joseph Patrick McGrail1, Alberto Paniz Mondolfi2, Juan David Ramírez2,3
1Department of Preventive Medicine, Public Health and Microbiology, Universidad Autónoma de Madrid, Madrid, Spain.
Journal of Medical Virology
|October 28, 2024
Summary
The 2022 MPOX outbreak shows monkeypox virus (MPXV) with a slower viral cycle and distinct protein expression compared to older strains. These differences may explain increased human-to-human transmission in the recent MPXV outbreak.
Area of Science:
- Virology
- Epidemiology
- Public Health
Background:
- The 2022-2024 MPOX outbreak is a global health concern caused by monkeypox virus (MPXV).
- MPXV exists as intracellular mature viruses (MVs) and extracellular enveloped viruses (EVs), differing in disease manifestation and transmission.
- Understanding MPXV diversity is crucial for managing outbreaks.
Purpose of the Study:
- To investigate the characteristics of MPXV strains from the 2022 outbreak.
- To compare the viral cycle, replication, and protein expression of current MPXV strains with historical ones.
- To identify potential mechanisms for increased human-to-human transmission.
Main Methods:
- Comparative analysis of viral cycles for 2022 outbreak MPXV strains.
- Proteomic and phospho-proteomic analysis to identify protein expression differences.
- Quantification of viral titers for different MPXV strains.
Main Results:
- MPXV strains from the 2022 outbreak exhibit a slower viral cycle than previous Clade II strains.
- WRAIR 7-61 showed intermediate viral replication, while USA 2003 produced higher titers.
- Proteomic and phospho-proteomic analyses revealed distinct protein expression profiles among the studied strains.
Conclusions:
- The 2022 MPXV outbreak involves strains with unique biological properties compared to historical isolates.
- Identified differences in viral cycle and protein expression may contribute to the observed increase in human-to-human transmission.
- Further research is needed to elucidate the precise mechanisms driving MPXV transmission dynamics.
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