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Miles A, Porch A, Choi H, Cripps S, Brown H, Williams C

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Authors not listed · 2025

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Non-thermal 2.45 GHz microwave radiation significantly accelerated bacterial growth, challenging claims that EMF only affects biology through heating.

Plain English Summary

Summary written for general audiences

Researchers exposed Staphylococcus aureus bacteria to pulsed 2.45 GHz microwave radiation (the same frequency as WiFi and microwave ovens) for 24 hours using a specialized high-throughput testing device. The microwave-exposed bacteria showed significantly faster growth rates and altered cellular chemistry compared to control groups, demonstrating that non-thermal microwave effects can stimulate bacterial reproduction.

Why This Matters

This study provides compelling evidence that microwave radiation at everyday frequencies can have profound biological effects even without heating tissue. The researchers used 2.45 GHz, the exact frequency of your WiFi router and microwave oven, and found it accelerated bacterial growth while changing the bacteria's internal chemistry. What makes this particularly significant is that the exposure was non-thermal, meaning the effects occurred without any temperature increase. This directly challenges the industry narrative that EMF is only harmful when it heats tissue. The fact that bacteria exposed to microwaves grew faster raises important questions about how this same radiation might affect the trillions of bacteria in your gut microbiome, which plays a crucial role in immune function, digestion, and even mental health.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2025). Miles A, Porch A, Choi H, Cripps S, Brown H, Williams C.
Show BibTeX
@article{miles_a_porch_a_choi_h_cripps_s_brown_h_williams_c_ce2514,
  author = {Unknown},
  title = {Miles A, Porch A, Choi H, Cripps S, Brown H, Williams C},
  year = {2025},
  doi = {10.1098/rsta.2024.0073},
  
}
DOI: 10.1098/rsta.2024.0073PubMed: 40400323

Quick Questions About This Study

Yes, this study found that Staphylococcus aureus bacteria exposed to pulsed 2.45 GHz microwaves for 24 hours showed significantly higher growth rates and optical density measurements compared to unexposed control bacteria, even without any heating effects.
Research shows that 2.45 GHz microwave exposure altered the redox state of bacterial cells, indicating changes in their internal chemistry. Fluorescent probes revealed these cellular changes occurred alongside the increased growth rates in exposed bacteria.
The study used 25 watts of pulsed microwave power at 2.45 GHz for 24-hour exposures. This power level was delivered through a specialized waveguide system that could simultaneously expose 96 biological samples to quantifiable electric fields.
Yes, the research demonstrated non-thermal effects from microsecond-pulsed 2.45 GHz microwaves. The bacterial changes occurred without temperature increases, proving that microwave radiation can have biological effects through mechanisms other than tissue heating.
The researchers developed a high-throughput rectangular waveguide system that can expose 96 biological samples simultaneously to controlled microwave fields. This represents a significant advance in EMF research methodology for studying biological effects efficiently.