Diffusion modelling of COVID-۱۹ by using natural and safe microparticles

A dangerous and novel human coronavirus (COVID-۱۹) which emerged in Wuhan, China, in late of ۲۰۱۹, is rapidly spreading all over the world, generating a high number of total deaths.Since practical and direct aerosol study of COVID-۱۹ is a very hard work and needs to have very safe and secure conditions, and at the same time, the possibility of contamination of the devices and the tested environment are very serious, so using and modelling of safe and natural particles behavior in air is an important alternative method of inquiry that revels interesting findings. We evaluated aerosol transmission and spread behavior of spores of two wild mushrooms. The first was Calvatia booniana with spore size about ۱ to ۲ μm and the second was Terfezia claveryi Chatin with ۲۰ μm. Firstly, we stained both types of spores with Giemsa and Methylene blue, and carefully recorded the morphological shape of the two micro particles, which were different in size and cytological characteristics under an optical microscope. We pumped the solution containing both large and small spores by special sprayers in covered air flow tunnels, ۳*۳*۳ cm۳, ۱۰ meters long. Because at intervals of half a meter inside the air tunnel, thin glass plates were placed for the settle of particles. After half an hour we examined the presence and frequency of spore particles settling on the glass placed under the microscope. Based on our primarily results, the larger micro particles with diameter of ۲۰ μm, can diffused about ۶۰ to ۷۰ cm, but small microparticles (۲ μm) were spread about ۲۰۰ cm. Since the COVID-۱۹ is about ۱۰۰ nanometers in size and assumes a direct ratio of size with the particle mass (m) and using the classical kinetic energy formula (½ mv۲), we estimated the approximate diffusion of COVID-۹ more than ۸ - ۹ meters in room air condition. Hence, results here revel that it is important, very important to know that the Coronavirus ۲۰۱۹ and similar viral agents spread through air in order to apply appropriate control measures directed to prevent the diffusion of the SARS-CoV-۲ and similar pandemics.

کلیدواژه ها:

COVID-۱۹ ، aerosol ، airborne transmission ، micro particles ، mushroom