COVID-19 Seroprevalence among Healthcare Workers of a Large COVID-19 Hospital in Rome Reveals Strengths and Limits of Two Different Serological Tests.

Healthcare workers are at the forefront against COVID-19, worldwide. Since Fondazione Policlinico Universitario A. Gemelli (FPG) IRCCS was enlisted as a COVID-19 hospital, the healthcare workers deployed to COVID-19 wards were separated from those with limited/no exposure, whereas the administrative staff were designated to work from home. Between 4 June and 3 July 2020, an investigation was conducted to evaluate the seroprevalence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunoglobulin (IgG) antibodies among the employees of the FPG using point-of-care (POC) and venous blood tests. Sensitivity, specificity, and predictive values were determined with reverse-transcription polymerase chain reaction on nasal/oropharyngeal swabs as the diagnostic gold standard. The participants enrolled amounted to 4777. Seroprevalence was 3.66% using the POC test and 1.19% using the venous blood test, with a significant difference (p < 0.05). The POC test sensitivity and specificity were, respectively, 63.64% (95% confidence interval (CI): 62.20% to 65.04%) and 96.64% (95% CI: 96.05% to 97.13%), while those of the venous blood test were, respectively, 78.79% (95% CI: 77.58% to 79.94%) and 99.36% (95% CI: 99.07% to 99.55%). Among the low-risk populations, the POC test's predictive values were 58.33% (positive) and 98.23% (negative), whereas those of the venous blood test were 92.86% (positive) and 98.53% (negative). According to our study, these serological tests cannot be a valid alternative to diagnose COVID-19 infection in progress.

Missed linkage to care for patients who screened positive for Hepatitis C in a tertiary care centre: Results of the Telepass project.

Italy is one of the countries on track with the WHO's agenda to eliminate hepatitis C virus (HCV) by 2030. Healthcare facilities play a crucial role in seeking patients who are infected but have not yet been treated. We assessed the effectiveness of a recall strategy, named 'Telepass' project, for patients exposed to HCV infection who have not yet been linked to care in a large tertiary care centre. The 'Telepass' project was structured in two phases: (a) a retrospective analysis first identified all anti-HCV-positive subjects among patients who underwent pre-operative assessment in the facility in the course of one year; (b) a following prospective phase, aimed to recall patients in need either of further diagnostic tests (ie HCV-RNA) or treatment. A total of 12246 records of patients tested for HCV antibodies were reviewed. The overall prevalence of anti-HCV-positive subjects was 1.83% (224/12246) with a male/female ratio of 2.07. Out of the 224 anti-HCV-positive patients, 123 (54.91%) did not have documented HCV-RNA tests and were therefore selected for recall. Of these, 123 were reachable and 26 (21.13%) were successfully linked to care. Ten patients (38.46%) tested HCV-RNA positive and initiated treatment with direct-acting antivirals (DAAs). The Telepass study highlights that a recall strategy starting from internal hospital databases can help identify patients with chronic HCV infection who have not yet been linked to care, and provides an epidemiological insight into the prevalence of HCV infection in Italy in the late DAAs era.