Introduction. On average, 10% of patients hospitalized due to new coronavirus infection (COVID-19) will be readmitted. To date, the reasons for readmission and the characteristics of these cases are not fully presented.The aim of the study was to analyze readmissions of COVID-19 patients to identify the causes of readmission, clinical features, examination data and treatment outcomes.Materials and methods. The study was performed retrospectively by using electronic records of the medical cases of the St. Petersburg City Hospital of St. George. Inclusion criteria: 1) the presence of two or more hospitalizations during 2020–2021; 2) COVID-19 confirmed by polymerase chain reaction within 14 days before or during the first hospitalization, or the detection of changes in the lungs with a high probability associated with COVID-19 during primary computed tomography. One hundred and two people met the specified criteria.Results. In 85% of cases, the cause of re-admission was symptoms of respiratory infection; in 13% – thrombotic events (pulmonary embolism, acute cerebrovascular accident, deep vein thrombosis of the lower extremities); 12% – severe pain syndrome of various localizations; 11% - infectious and inflammatory processes; 9% – antibiotic-associated diarrhea; 5% – atrial fibrillation and less often other pathologies. Patients with respiratory symptoms had a high degree of respiratory failure, an increase in the volume of affected lung tissue and an increase in the content of various markers of inflammation in the blood when compared with the data of the initial examination. Nine percent of patients died during hospitalization.Conclusions. The leading cause of repeated inpatient treatment of COVID-19 patients were symptoms of reactivation of the infection with a number of indicators of a greater severity of this “second wave” of the disease. Further studies are required to reduce the risk of repeated inpatient treatment.

<b>Background.</b> In recent years, social media more and more are mentioned such as the source of medical information. The aim of our study is to evaluate the significance of the information published in medical blogs for undergraduate medical students from Russia. <br><b>Materials and methods.</b> 124 undergraduate (fifth- and sixth-year) students of the educational program "General Medicine" of medical universities of Russia took part in an online survey. Statistical analysis was performed using descriptive statistics, Chi-square test and Spearman's rank correlation coefficient. <br><b>Results.</b> Among the students surveyed, 82.7% subscribed to physicians’ medical blogs. Students most commonly subscribe to medical blogs to stay up-to-date with the latest trends in medicine and to receive information in areas of interest. 68.4% of respondents follow blogs with topics that match their prospective future specialities. 84.5% of surveyed students consider it necessary to verify the information published in blogs in specialized literature. 56.1% of interviewees made recommendations based on information from medical blogs to their familiar. Female students were more likely to consult a specialist after reading his or her posts on social media than male students (26.9% vs 5.7%, p=0.009). 69.6% of respondents trust information from medical blogs more than from university professors in certain cases. <br><b>Conclusions.</b> The results of our research attest that a significant part of students is interested in using the recommendations presented in medical blogs in their further practical activities. However, the dynamics of the attitude of students and young doctors to information published in medical blogs, as practical experience accumulated, requires further study.