Preface

Ref:Source: Centers for Disease Control and Prevention’s Public Health Image Library

Center for Disease Control (CDC) declared the outbreak of a respiratory disease caused by a novel (new) coronavirus that was first detected in China and then within a short span of time it spread almost all countries in the world, including United States. The virus has been named “SARS-CoV-2” and the disease it causes has been named “coronavirus disease 2019” (abbreviated “COVID-19”). Recently, World Health Organization (WHO) declared the outbreak a “public health emergency of international concernexternal icon” (PHEIC). On March 11, WHO publiclyexternal icon characterized COVID-19 as a pandemic.