Hardy bacteria found living inside microwaves

Microwave ovens, commonly used for heating food, have been found to harbor a diverse range of bacteria, according to a study led by Manuel Porcar from the University of Valencia. Researchers sampled 30 microwaves from various settings, including domestic kitchens, shared kitchens, and laboratories, discovering 747 different genera of bacteria across 25 phyla. The diversity of bacteria was lowest in single-household microwaves and highest in laboratory settings. Many bacteria found in domestic microwaves were similar to those on human hands, suggesting that food remnants may protect them from radiation. Some bacteria, such as Klebsiella and Enterococcus, could pose health risks, but the overall microbial presence in microwaves does not present a unique risk compared to other kitchen surfaces. The study emphasizes the need for regular cleaning of microwaves, as they cannot be assumed to be cleaner than other kitchen areas. Belinda Ferrari from the University of New South Wales supports the findings and advocates for better cleaning practices, particularly in workplace settings. She also suggests further research on the microbiome before and after cleaning.

- Microwaves contain a wide variety of bacteria, with 747 genera identified in a study.

- Bacterial diversity is highest in laboratory microwaves and lowest in single-household ones.

- Some bacteria found may pose health risks, but overall risk is comparable to other kitchen surfaces.

- Regular cleaning of microwaves is essential to maintain hygiene.

- Further research is needed on the impact of cleaning on microwave microbiomes.