Dispersion characteristics of human expiratory droplets and droplet nuclei in a mechanically ventilated general hospital ward

That study was carried out in a general hospital ward in Hong Kong, equipped with ceiling-mixing type ventilation system to analyse the dispersion characteristics of expiratory droplets. A model has been used to simulate the motion tracks of the droplets and droplet nuclei. The results show that the dispersion characteristics were size-specific and highly affected by the ventilation air flow pattern. The laterally projected air jets should be avoided in ward ventilations.