COVID-19 [8] [9] is an infectious disease pandemic caused by the SARS-CoV-2 virus and its variants that is taking place globally. [10] Originated at the end of December 2019 [b] with the first mind at to city Wuhan in central China, stemming from a group of people with an infection of unknown cause. Local health officials confirmed that they had previous contact, mainly with commercial business people and working at the Huanan seafood market. Chinese scientists who conducted research and analysis established a coronavirus that the World Health Organization then temporarily called 2019-nCoV, [c] has the character like as SARS-CoV before here with the level corresponds to 79.5%. [11] [12] [13]

The first suspected cases in Wuhan were reported on December 31, 2019. The first case of SARS-CoV-2 death appeared in Wuhan on January 9, 2020. [14] The first confirmed viral infections outside of China include two women in Thailand and a man in Japan. [15] [16] [17] The virus infection from singers was confirmed along with the calm fee that developed in mid-January 2020. [18] January 23, 2020, the Chinese government all decided to block Wuhan, the public transport system and import and export activities were suspended. [19]

On March 11, 2020, the World Health Organization (WHO) declared "COVID-19" a "Global Pandemic". [8] [9] [20] [21] [22] [23 ]

Governments around the world conduct responsive responses to protect the health of people and communities around the world, including: travel restrictions, quarantine blockade, declaration of emergency status , using limit orders, implementing social distancing, canceling mass events, closing schools and services, low-key businesses, encouraging people to raise their own awareness of disease prevention, face masks , limit going out when not necessary, and at the same time transform the business model, study and work from traditional to online. For example, a blockade to test the entire service in Italy and China's Hubei province; Measure standards are different in China and Korea; filtration methods at airports and train stations; restrict or cancel travel activities to areas, regions, countries with high risk of infection. In addition, schools were also closed nationwide or in some regions in more than 160 countries, affecting 87% of students worldwide, as of March 28, 2020.[ 24 ]

The worldwide effects of the current COVID-19 pandemic include: loss of life, economic and social unrest, [25] [26] xenophobia and racism For Chinese and East Asian roots, online disinformation and biological weapons. [27] [28]