Covid-19 Transmission
As the COVID-19 spreads, from the place of origin, because of the genetically and structurally relation between SARS COVID-19 and other viruses from zoonotic animals researchers have revealed that the virus has transmitted to a human, and then human to human transmission started (Chan et al. 2020; Del Rio and Malani 2020). the most common way of infection is transmitted mainly via those respiratory droplets when ejected at the time of cough, sneezing, and speaking. Close contact is another most prevalent in the process of virus transmission among the population (The Chinese Preventive Medicine Association 2020). Despite that, there may be another way with a high risk like transmission via fecal-oral transmission, as some laboratory results have recognized the virus in the stool of some patients from China and the United States (Holshue et al. 2020). However, whether SARS-CoV-2 can be spread through aerosols or from mothers to their newborns is yet to be confirmed (Chen, Guo, et al. 2020; WHO 2020c; Zhu et al. 2020) Although patients with symptomatic COVID-19 have been the main source of transmission, and asymptomatic patients and patients in their incubation period are also carriers of SARS-CoV-2 (Chan et al. 2020; Rothe et al. 2020).because of this unique feature that COVID-19 has, put researchers in a difficult situation to find out how to control further spreading the virus, as it is difficult to identify and quarantine patients before SARS-CoV-2 occupy the whole communities (The Chinese Preventive Medicine Association 2020).the remaining source of transmission the patients in the period time of recovering (Rothe et al. 2020).
At the end of the above comparison, we concluded the approximate average mortality rate among these three infectious diseases around the world, is showing a very significant difference, as the (figure 5) vividly illustrates this aspect of the comparison for them. The average mortality rate for SARS-COVID1 by the division of death rate to the total infectious cases, that confirmed at the time of outbreak like an epidemic, the resulting of more than 8,000 with approximately 10% mortality. As figure 6 depicted that the mortality rate for SARS-COVID1 is much lower than the MERS, but when we compared it with SARS-COVID 19 we get the opposite result, despite that the SARS-COVID19 still on the ongoing and has occupied the whole world but mortality rates remaining lower.