Characteristics of Covid Virus.
SARS, MERS and Ebola viruses were contagious only when the symptoms appeared in the human body and it is therefore easy to keep the infected persons isolated from the healthy humans but with COVID-19 there are symptom-less spreaders or super-spreaders or unknown factors. In that case it becomes difficult to identify the the time of infection and it’s dissemination. It is believed that the healthy humans or the humans without the symptoms of the infection can act as super-spreaders. If a virus infects a person it will run its course naturally and die out but if the patient comes into contact with another human, the infection spreads again and this way it becomes exposed and open in the people, creating pandemic.
Reason for dissemination of Covid 19
COVID-19 spreads easily in crowded confined or may be in the open spaces at homes, schools, institutions, shopping malls, stations, platforms, hospitals, ships and those places where people have access and to be in large numbers. When a sick person coughs, sneezes, talks or breathes, the virus gets transmitted through droplets and can travel to five to six feet.
COVID-19 Versus Other Coronaviruses
SARS-CoV-2 is new to humans. It has a similar genetic sequence to other coronaviruses that live in bats and similar animals yet it is distinct from SARS and MERS coronaviruses in the process of incubation and dissemination.
SARS coronavirus primarily affect the lungs whereas COVID-19 creates an upper respiratory tract infection from the throat. People with low immunity, especially, the elderly and the children or those with pre-existing diseases are more prone to be infected.
It is confirmed that COVID-19 is more contagious than SARS and MERS. The transmissibility or severity of COVID-19 is not yet confirmed with certainty. People above the age of 60 are at risk of life although deaths are happening in every age group.The fatality rates are higher for the people with cardiovascular disease, diabetes,cancer, hypertension and chronic respiratory diseases.