BBC was pushing the following yesterday. sounds like masks stop nothing!
6 June: MedicalXpress: Mouth-to-mouth resuscitation during COVID-19: Study shows using a face mask works
by The European Society of Anaesthesiology and Intensive Care (ESAIC)
New research being presented at the annual meeting of the European Society of Anaesthesiology and Intensive Care (ESAIC) in Milan, Italy (4–6 June), shows it is practical to learn how to do mouth-to-mouth resuscitation while wearing a face mask to reduce the risk of COVID-19 transmission...
Trained observers evaluated each rescue breath. More than 90% of the breaths into the mouth of each manikin were judged effective, meaning they led to the manikin’s chest rising...
https://medicalxpress.com/news/2022-06-mouth-to-mouth-resuscitation-covid-mask.html