Coronavirus disease (COVID-19) has infected nearly one million people and had killed thousand in the world, which originated from Wuhan, China that was discovered in 2019 and spread to other countries in the world.

What is coronavirus?
According to the World Health Organization (WHO) coronavirus disease(COVID-19) is an infectious disease caused by a newly discovered coronavirus.
According to the research coronavirus are a family of viruses that cause disease in animal.
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
Moreso, viruses spread in many ways. One transmission pathway is through disease bearing organisms known as vectors, for example, virusare often transmitted from plant sap, such as aphids, and virus in animals can be carried by blood sucking insects.

Where does it originated from?

In December 2019, a pneumonia outbreak was reported in Wuhan, China. On December 2019, the outbreak was traced to a novel strain of coronavirus, which was given the interim name 2019-nCoV by the world health organization (WHO) later renamed SARS-CoV-2 by the international committee on taxonomy of viruses.

Further more, how does it transmitted to human since virus transmitted from living cell to living cell.

Some group of researchers believed that coronavirus is from a wet market in Wuhan which sold bothdead and live animals including fish and birds.
Such market pose a heightened riskof virus jumping from animals to humans because hygiene standards are difficult to maintain if live animals are being keptand butchered on site. Typically, they are also densely packed allowing disease to spread from species to species.

Another group of researchers believed that the Huanan seafood wholesale market may not be the original source of viral transmission to humans.
The virus has similarity to a bat coronavirus, so it is widely suspected to originated from bats as well.

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