Ultrasound effectively destabilizes and disrupts the structural integrity of enveloped respiratory viruses
et al., Scientific Reports, doi:10.1038/s41598-026-37584-x, Feb 2026
In vitro study showing that high-frequency ultrasound in the 3-20 MHz range can physically destroy enveloped respiratory viruses - both SARS-CoV-2 and Influenza A (H1N1) - through a resonance-driven mechanical mechanism.
SARS-CoV-2 infectivity was markedly reduced in Vero-E6 cells, with near-complete elimination of viral replication at optimal frequencies. The effect operated without measurable changes in temperature or pH, distinguishing it from classical cavitation-based ultrasound sterilization (which uses kHz frequencies and causes indiscriminate tissue damage). The mechanical index remained within standard diagnostic safety limits (0.3-0.5), suggesting the approach could be compatible with living tissue.
This raises the possibility of a personal device designed for early intervention against upper respiratory infections. Since the primary location of initial infection and replication for COVID-19 and influenza is the nasal epithelium, a compact ultrasound transducer could potentially deliver 7.5 MHz acoustic energy directly to the site of early viral replication. Flooding the nasal cavity with sterile saline before or during treatment would closely replicate the liquid-medium conditions used in the study, where viral particles were suspended in buffer solution. Saline is an excellent acoustic conductor, and filling the nasal cavity would eliminate the air gaps that block ultrasound transmission, ensure uniform acoustic coupling throughout the complex nasal geometry, suspend extracellular virus in a medium similar to the experimental setup, and allow physical washout of disrupted viral fragments after treatment. Saline nasal irrigation is already widely practiced and well-tolerated, so the addition of a small ultrasound transducer at the nostril during a rinse would not be a large change. Portable, wireless ultrasound probes operating at exactly 7.5 MHz already exist commercially for diagnostic imaging, meaning the core hardware platform is available. A hypothetical therapeutic version might involve flooding one nostril with saline, placing a small transducer at the opening for 5-10 minutes, then allowing drainage - effectively combining a standard sinus rinse with targeted acoustic viral disruption. Because virus at the early symptomatic stage is largely extracellular, sitting on the mucosal surface or transiting between cells, this scenario closely approximates the free-floating conditions that proved effective in the laboratory. Significant unknowns remain, including acoustic field distribution within the complex nasal cavity geometry, how different viral variants and future strains would respond, and further modeling and human safety studies.
Veras et al., 13 Feb 2026, Brazil, peer-reviewed, 9 authors.
Contact: fprotasio@ifsc.usp.br, bruno@ifsc.usp.br.
In vitro studies are an important part of preclinical research, however results may be very different in vivo.
Ultrasound effectively destabilizes and disrupts the structural integrity of enveloped respiratory viruses
Scientific Reports, doi:10.1038/s41598-026-37584-x
This study demonstrates that high-frequency ultrasound (3-20 MHz) can effectively disrupt the structural integrity of both Influenza A virus (H1N1) and SARS-CoV-2 through a resonance-driven mechanism distinct from classical cavitation (kHz range). Under these conditions, viral particles undergo pronounced alterations (fragmentation, envelope rupture, and loss of morphological uniformity) consistent with direct mechanical destabilization rather than thermal or bubble-mediated effects. Detailed structural analyses revealed significant disruption of the viral envelope, accompanied by measurable shifts in particle size distribution and reduced diameters, indicative of resonanceinduced fragmentation. These structural modifications were paralleled by biological consequences: SARS-CoV-2 infectivity was markedly reduced in vitro, with infected cells exhibiting substantially lower viral loads. Importantly, this work provides the first experimental evidence that acoustic resonance can directly couple with viral structural components, inducing selective mechanical destabilization of the envelope. The convergence of structural and functional data supports the view that this represents a previously undescribed biophysical phenomenon, fundamentally distinct from cavitation. This resonance-mediated destabilization highlights a novel, non-invasive, and broad-spectrum antiviral strategy that differs from cavitation, more suited to asepsis and sterilization, and offers a therapeutic approach with potential applications against enveloped respiratory viruses and other clinically relevant pathogens.
Author contributions
Declarations
Competing interests The authors declare no competing interests.
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