Living spores sealed in a 3D-printed shell suppress MRSA for a month.

Harmful bacteria are becoming resistant to drugs, so scientists need new ways to fight them. Using helpful microbes to outcompete bad germs is a promising idea, but keeping them alive and working in real-world settings is difficult. To solve this, researchers 3D printed tiny core-shell structures. They placed dormant spores of helpful bacteria, called Bacillus subtilis TH035, inside a protective outer shell made of a polymer with tiny nanoscale pores. This shell shields the spores from drying out over 4 weeks, as well as from ethanol and UV-C light, while keeping them safely trapped inside. When moisture and nutrients pass through the porous shell, the spores wake up and grow. They release substances that cut the growth of the drug-resistant pathogen MRSA by approximately one order of magnitude.

Why it matters

Drug-resistant bacteria like MRSA are a growing threat in hospitals, food packaging, and buildings. This platform lets beneficial bacteria be embedded into surfaces or packaging in a protective shell, so they stay alive for weeks and suppress MRSA when conditions allow. That offers a practical alternative to antibiotics for reducing resistant pathogens in everyday environments.

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