Corona virus is an infectious disease at the same time a contagious. The World Health Organization (WHO) defines an infectious disease as, “Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi; the diseases can be spread, directly or indirectly, from one person to another. Zootoxic diseases are infectious diseases of animals that can cause disease when transmitted to humans”. It gets into the body and causes problems; some of them but not all infectious diseases spread directly from one person to another. N 95 Mask As Protection Against The Corona Virus Contagious diseases such as … Continue reading Corona Virus-19: An Understanding of the Production-number R0