The airborne transmission of SARS-CoV-2 is still debated. The aim of this rapid review is to evaluate the COVID-19 risk associated with the presence of air-conditioning systems. Original studies (both observational and experimental researches) written in English and with no limit on time, on the airborne transmission of SARS-CoV, MERS-CoV, and SARS-CoV-2 coronaviruses that were associated with outbreaks, were included. Searches were made on PubMed/MEDLINE, PubMed Central (PMC), Google Scholar databases, and medRxiv. A snowball strategy was adopted to extend the search. Fourteen studies reporting outbreaks of coronavirus infection associated with the air-conditioning systems were included. All studies were carried out in the Far East. In six out the seven studies on SARS, the role of Heating, Ventilation, and Air Conditioning (HVAC) in the outbreak was indirectly proven by the spatial and temporal pattern of cases, or by airflow-dynamics models. In one report on MERS, the contamination of HVAC by viral particles was demonstrated. In four out of the six studies on SARS-CoV-2, the diffusion of viral particles through HVAC was suspected or supported by computer simulation. In conclusion, there is sufficient evidence of the airborne transmission of coronaviruses in previous Asian outbreaks, and this has been taken into account in the guidelines released by organizations and international agencies for controlling the spread of SARS-CoV-2 in indoor environments. However, the technological differences in HVAC systems prevent the generalization of the results on a worldwide basis. The few COVID-19 investigations available do not provide sufficient evidence that the SARS-CoV-2 virus can be transmitted by HVAC systems.

Burnout syndrome (BOS) is a work-related constellation of symptoms characterized by emotional exhaustion, depersonalization, and personal accomplishment. A cross-sectional survey was performed to study the prevalence of BOS among a randomly selected sample of 280 Italian Red Cross volunteers. A socio-demographic questionnaire and the Maslach Burnout Inventory (MBI)-HSS were used to collect data. 241 volunteers participated (response rate: 86.1%). A significant proportion of the workers had BOS subscale scores in the highest tertile: emotional exhaustion 8.0%, depersonalization 35.9% and perceived lack of accomplishment 23.5%, respectively. Volunteers in emergency care reported higher levels of emotional exhaustion ( p =0.004) and depersonalization ( p =0.001), and lower level of personal accomplishment ( p =0.042) than volunteers engaged in non-healthcare social and administrative duties. These findings support the opportunity of a set of administrative, organizational and individual preventive interventions for emergency volunteers’ mental health.

PurposeThis paper describes how Italy addressed the first Coronavirus disease 2019 (COVID-19) wave and analyzes the possible causes of the current second wave.Design/methodology/approachDescriptive analysis of critical points and differences in the containment strategies between the first and the second waves in Italy.FindingsItaly's strict lockdown has been credited with getting the initial major outbreak under control. Furthermore, the way Italy handled the first wave was considered a lesson for other countries. On the contrary, a decentralized and highly bureaucratic political system with low coordination and political conflicts between government, regions and stakeholders led to a relaxation of individual health behaviors, poor and conflicting communication to the general public, poor management of the public transport and the reopening of schools and companies after the summer, that in turn generated the second wave, which is showing signs of becoming worse than the first.Originality/valueThis is a commentary piece.

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