Ricardo Gonzalez
(Figure 1) Bacterial colony formation
Figure 1. represents how much bacterial colony formed in units per cubic meter (CFU/m^3) in hospitals. (blue) represents without an HVAC system, (orange) use of conventional HVAC, and (grey) with the use of an enhanced HVAC system. This represents how the different types of filters and quality had an effect of the presence of bioaresoles.
Figure 2. represents the same ting but this is fungal colony formation
Hospitals around the world are essential for human health but as a consequence, everyone is mostly sick, causing many bioaerosols to roam freely. The objective of this experiment is to evaluate the relationship between HVAC systems and bioaerosol concentration between different hospital rooms. As to when it comes to results, HVAC systems that are enhanced effectively remove bioaerosols but this is predictive, since these are restricted areas, which are meant to be clean and concise throughout. This study was influenced because of the coronavirus disease in 2019 HVAC systems are known to speed up the change and direction of indoor airflow which researchers suspect the HVAC systems may increase the SARS-CoV-2 infection back in 2019 along with current viruses and bioaerosols infectious diseases. The results come to prove that conventional HVAC systems, effectively remove bacteria and fungi from indoor air and enhanced HVAC systems were a lot more effective than conventional HVAC systems in this study. The figures for bacterial colony formation shows that inpatient facilities without HVAC systems had a CFU/m^3 of 356.45 compared to restricted areas without HVAC system where the value of CFU/m^3 was 387.50. If you are to compare this with the values of enhanced HVAC systems, the inpatient facility would have a 20 CFU/m^3 value and restricted area of 36.12 significantly decreasing the amount of bioaerosols in the system in both environments. Overall study concluded that the infection risk associated using HVAC systems did not increase infection risks during the pandemic. All that HVAC systems do in hospitals is to simply reduce the indoor concentrations of bioaerosols which was concluded at the end of the research.
Original article:
Dai, Rongchen, et al. “A Systematic Review and Meta-Analysis of Indoor Bioaerosols in Hospitals: The Influence of Heating, Ventilation, and Air Conditioning.” PLOS ONE, vol. 16, no. 12, 23 Dec. 2021, p. e0259996, https://doi.org/10.1371/journal.pone.0259996. Accessed 24 Apr. 2022.
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