On March 12, Beijing time, the WHO declared the new crown epidemic a pandemic. There are several commonly used terms in epidemiology: First, an outbreak. An outbreak usually refers to a sudden increase in an explosion that exceeds expectations or is found in a place that has never been discovered before. Outbreaks are often limited to a relative Smaller area. For example, the cholera epidemic following the Haiti earthquake in 2010;
Twenty-two is epidemic, which usually means that the outbreak is spread over a larger geographical area. For example, the Zika virus began to spread in Brazil in 2014 and spread to most parts of Latin America and the Caribbean. The Ebola outbreak in West Africa in 2014-2016 was a large-scale epidemic and was considered an epidemic;
The third is a pandemic. A pandemic is a pandemic. For example, the Spanish flu of 1918, which infected more than a third of the world's population, killed 50 million people. Several influenza pandemics later occurred, including H2N2 in 1957, H3N2 in 1968, and H1N1 in 2009.
The main reason that the virus will disappear in the summer is based on the understanding of the surface phenomenon of the 2003 SARS epidemic because, in 2003, SARS was announced by the World Health Organization in July of that year, and the SARS virus did not reappear. However, we should not forget that when the SARS epidemic occurred in the year, the world, especially China, also adopted robust prevention and control measures, including the rapid detection of cases for isolation, and the close-knit population tracking each case for isolation and medical observation and control. Measures to successfully prevent and control the epidemic.
The rise in temperature may have a particular impact on the survival of the virus under natural conditions. For example, in the summer in temperate regions, the low influenza activity is proof. Therefore, it is speculated that the rise in summer temperature may reduce the epidemic intensity, but it is unlikely to disappear naturally.
The new coronavirus that caused the epidemic belongs to the same type of virus as the SARS virus, with some similarities. The genetic homology is about 80%. Using the same cellular receptor ACE2, its original natural host maybe bats.
However, there are many differences between the two. For example, the new coronavirus is different from the SARS virus in clinical manifestations. SARS patients are mainly severe, so we can easily find SARS patients. However, new crown patients are asymptomatic, Pneumonia, pneumonia to severe pneumonia, critically ill patients also show multiple clinical manifestations including systemic multiple organ damage, and asymptomatic infection may even become the source of infection, which increases the difficulty of us to find the source of infection.
The spread of the new coronavirus is covert and periodic. There are specific difficulties in controlling the epidemic. At the beginning of the spring of 2020, the virus was rampant. Until now, it is not difficult to find that the number of confirmed cases worldwide has far exceeded 130,000.
The impact of the epidemic has led all countries to initiate emergency treatment modes and close all entertainment and catering gatherings. Do not go out; major construction and industrial companies stop production. This caused severe losses to the economy. The world is trying to carry out macroeconomic regulation and control to minimize the impact of the epidemic on the economy. We will eventually believe that the effects of the pandemic is temporary, and hope that the outbreak will recede and that all industries will usher in their high development.
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