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In the present review, we analyzed publications describing healthcare professionals who were found to be the sources of hepatitis B and C, influenza A (H3N2), adenovirus type 1 pneumonia, and parvovirus B19. These healthcare-associated outbreaks were registered in inpatient facilities. The article discusses the role of healthcare professionals in the transmission of methicillin-resistant Staphylococcus aureus (MRSA) strains. All healthcare institutions have to implement a number of preventive and antiepidemic measures, including the system of strict control and regular laboratory testing of healthcare professional for timely identification of infectious diseases in them and their suspension from work, with particular attention paid to healthcare-associated infections. Key words: healthcare professionals, source of infection, outbreaks, healthcare-associated infections.

Respiratory tract infections (influenza, acute respiratory infections (ARIs), community-acquired pneumonia, etc.) pose a serious threat to organized groups (including military personnel, cadets, students of military universities, and schools). The most common complication of ARI is community-acquired pneumonia, severe forms of which may result in an unfavorable outcome. The use of some drugs, such as Carmolis ensures a 2.0–3.8 times reduction in the incidence of ARIs in organized groups and a 2.3–3.0 times reduction in the incidence of community-acquired pneumonia. Carmolis has a pronounced non-specific protective effect and increases resistance to respiratory tract infections by promoting nonspecific resistance of the organism. This prevents significant economic damage and reduces the number of complications and poor outcomes. Keywords: organized groups, biological and social emergencies, respiratory tract infections, community-acquired pneumonia, acute respiratory infections, coronavirus infection, Carmolis, non-specific resistance, non-specific prevention of acute respiratory infections, epidemiological effectiveness

Relevance According to many researchers, hepatitis D worsens the prognosis of hepatitis B in 80–90% of cases, accelerating fibrosis and leading to liver cirrhosis or hepatocellular carcinoma. Aims. To present a review of data on prevalence of hepatitis D in the Russian Federation and abroad. Conclusions. Hepatitis D is most common in such regions of the world as: Africa, South America, Middle East, North Asia and in some Mediterranean countries. Conclusions. Injecting drug users play a large role among vulnerable populations. Hepatitis B vaccination limits the spread of hepatitis D.