Corona viruses have caused two large-scale pandemics in the past two decades, SARS and Middle East respiratory syndrome (MERS). It has generally been thought that SARS-CoV which is mainly found in bats could cause a future disease outbreak. The novel Corona virus disease 2019 (COVID-19) is caused by SARS-CoV-2, which is the causative agent of a potentially fatal disease that is of great global public health concern. The outbreak of COVID-19 is wreaking havoc worldwide due to inadequate risk assessment regarding the urgency of the situation. The COVID-19 pandemic has entered a dangerous new phase. When compared with SARS and MERS, COVID-19 has spread more rapidly, due to increased globalization and adaptation of the virus in every environment In December 2019, a cluster of patients with pneumonia of unknown cause was linked to a seafood wholesale market in Wuhan, China. Different from both MERS-CoV and SARS-CoV, 2019-nCoV is the seventh member of the family of corona viruses that infect humans. On December 31, 2019, the Chinese Center for Disease Control and Prevention (China CDC) dispatched a rapid response team to accompany Hubei provincial and Wuhan city health authorities and to conduct an epidemiologic and etiologic investigation. In this article different invasion and diagnosis of corona virus is dealt with.
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