Unexpectedly low Incidence of COVID-19 among Refugees of War from Ukraine to Slovakia in First Month of Conflict (Original Research)

Several armed conflicts and military troop interventions have been associated with minor pandemics, however, not always, and with the extent varied. e.g. during the most catastrophic loss of lives in the Bosnian Conflict in 1993-95 where 160,000 civilians and soldiers fell into mass graves, only one small epidemic of Hepatitis A was reported to the European branch of WHO. In contrast, epidemics of cholera in Haiti, not related to war but associated with troop deployment (UN battalion from Nepal) in 2014, led to a devastating epidemic of cholera in the Artibonite River District with 1,000s of deaths. The same was reported during civil war and genocide in Rwanda in 1988-98 where hundreds died, and refugees of war-related exodus from Rwanda to the DRC in Goma. Finally, pipeline and water supply devastation during war in Yemen, led to the largest cholera outbreak in Yemen (1-3). Therefore, fear of epidemics, especially during COVID-19 Omicron wave is of concern mainly when the numbers of positive cases in Austria and other EU countries are increasing. The aim of this study was to report the results of COVID-19 antigen testing in those escaping from war in Ukraine.

How distant? An experimental analysis of students' COVID-19 exposure and physical distancing in university buildings.

Closed university buildings proved to be one of the main hot spots for virus transmission during pandemics. As shown during the COVID-19 pandemic, physical distancing is one of the most effective measures to limit such transmission. As universities prepare to manage in-class activities, students' adherence to physical distancing requirements is a priority topic. Unfortunately, while physical distancing in classrooms can be easily managed, the movement of students inside common spaces can pose high risk of close proximity. This paper provides an experimental analysis of unidirectional student movement inside a case-study university building to investigate how physical distancing requirements impact student movement and grouping behaviour. Results show general adherence with the minimum required physical distancing guidance, but spaces such as corridors pose higher risk of exposure than doorways. Doorway width, in combination with group behaviour, affect the students' capacity to keep the recommended physical distance. Furthermore, questionnaire results show that students report higher perceived vulnerability while moving along corridors. Evidence-based results can support decision-makers in understanding individuals' exposure to COVID-19 in universities and researchers in developing behavioural models in preparation of future outbreaks and pandemics.

Recovery of microbiological quality of long-term stagnant tap water in university buildings during the COVID-19 pandemic.

Stagnant water can cause water quality deterioration and, in particular, microbiological contaminations, posing potential health risks to occupants. University buildings were unoccupied with little water usage during the COVID-19 pandemic. It's an opportunity to study microbiological quality of long-term stagnant water (LTSW) in university buildings. The tap water samples were collected for three months from four types of campus buildings to monitor water quality and microbial risks after long-term stagnation. Specifically, the residual chlorine, turbidity, and iron/zinc were disqualified, and the heterotrophic plate counts (HPC) exceeded the Chinese national standard above 100 times. It took 4-54 days for these parameters to recover to the routine levels. Six species of pathogens were detected with high frequency and levels (101-105 copies/100 mL). Remarkably, L. pneumophilia occurred in 91% of samples with turbidity > 1 NTU. The absence of the culturable cells for these bacteria possibly implied their occurrence in a viable but non-culturable (VBNC) status. The bacterial community of the stagnant tap water differed significantly and reached a steady state in more than 50 days. Furthermore, a high concentration of endotoxin (>10 EU/mL) was found in LTSW, which was in accordance with the high proportion of dead bacteria. The results suggested that the increased microbiological risks require more attention and the countermeasures before the building reopens should be taken.