Environmental factors act as the fulcrum in deciding the outcome of the interaction between disease agent and human host. Occurrence of any outbreak of emerging zoonotic disease like Ebola, Nipha, SARS, MERS and Novel COVID-19 infectious is a manifestation of ecological imbalance due to anthropogenic behaviour of man. Pandemic or any disease outbreak results in increase in physical morbidity among people. This affects the psychosocial dynamics of a community resulting in social disability and tension. Behavioural changes occur in all sections of people of the civil society like health care seekers, health care providers, and leaders. The current great pandemic of the millennium caused by the SARS CoV-2 has been ravaging the world with its wildfire spread to all the countries of the world since its emergence in China in December 2019. As per the World Health Organization (WHO)Corona Virus report no.103 of Second May 2020, the global incidence of infected case is 3.67 million with 7% mortality. On Second May 2020, at the global level 91,977 new cases of Novel COVID-19 cases and 5,799 cases were reported. In India, the incidence of cases reported till Second May 2020 was 37,336 with a mortality rate of 3.2%and 5,799 deaths. There is a great uncertainty about the scale of the epidemic due to transmission of coronavirus as it is emerging disease in each country. We are not able to estimate how many people will be infected and how many of them will die. It will vary from community to community due to several factors. In recent days there is enough database on Novel COVID-19. This paper reviews relevant evidence and some of the gaps therein and lessons learnt. The aim is to gather the discipline wise research finding and present in a comprehensive manner by constructing a natural history of Novel COVID-19and plausible preventive package and strategy for its control.
Holobiont: An assemblage of a host and many species living in an around it which togethers forms a distinct ecological unit.
Crowd Sourcing: Process of obtaining information or input into task by searching various news reporting, press release, information in Wikipedia, personal communication and observations. When line listing of cases is not available, compilation and analysis of crowd sourced data is the only way to find out the trend.
Immigrant Virus: Novel COVID-19 virus originated in China and brought into other countries by immigrant travellers and caused infection of people in the community.
Seeding: Term is used in describing an outbreak of infectious disease in a community. Seed here is an infected person and transmission from him to the second person is the process is seeding in a community.
First and Second generation of case: The term is used as a synonym of Index case and secondary case. The terms used in preventive medicine is in context of individual patient. Terms such as immigrant virus, seeding, first generation and second generation cases are coined in context to spread of infectious disease in a community.