A very small study of 4 patients coughing with and without a surgical or cloth mask showed neither was better than no mask in reducing cultured virus.

Particles 0.04-0.2 μm can penetrate surgical masks. SARS COV1 (not COV2) particle is 0.08 to 0.14 μm. https://annals.org/aim/fullarticle/2764367/effectiveness-surgical-cotton-masks-blocking-sars-cov-2-controlled-comparison#

The number is the viral loads that were cultured, each colum is one of the 4 patients

We need a larger study and verification of findings. The viral loads may vary across patients.

This is disconcerting if true and indicates viruses may pass through both types of mask.