"Based on Australian data, it is likely between 10 and 15 percent of Covid deaths are from hospital-acquired infections. Improved baseline standards for hospital ventilation had to be a top priority for mitigating Covid and other respiratory illnesses."
https://www.rnz.co.nz/news/what-you-need-to-know/545120/too-many-catching-covid-19-in-hospital-experts-say-but-precautions-being-rolled-back