One of the important factors of medical deontology is the focus of a healthcare professional on the health of patients and colleagues in case of increased infectious morbidity within the framework of limiting transmission of an infectious agent. The aim of the study was to assess the true frequency of regulated use of PPE, including in the provision of medical care to patients with COVID-19, and compliance with the isolation regimen in case of respiratory illness among health workers. The study was conducted using the Internet (the questionnaire is posted on ancetolog.ru) from January to March 2022 (ongoing COVID-19 pandemic). Survey data of 3,570 respondents was analyzed in accordance with the quality criteria for filling out the questionnaires. The overwhelming majority of the respondents were women, 63.6% (2,269 people) and 36.4% (1,299 people) were men, the average age of the respondents was 38.9 ± 14.22 years. Non-compliance with the rules of wearing PPE was detected for every fourth respondent (24.9%), 4.1% refused to wear PPE, and 7% complied with the rules of wearing PPE in the workplace only when their non-compliance could be noticed. The data we have obtained indicates that a quarter of health workers do not follow professional ethics in the framework of preventive measures to reduce infectious diseases, threatening the health of colleagues and patients by their behavior in the workplace.