COVID-19 is the name for a flu-like disease, with a very fast contagion through sars-cov-2 coronavirus that is transmitted from person to person and is found in the saliva microdrops that breathes, or touches and is carried to the nose, mouth or eyes, a healthy person. It has a low mortality rate, which increases considerably in patients over 60 years of age (immunosenescence) and/or with previous diseases as is the case with other influenzas and sars. The first cases appeared in China in December 2019 and by March 2020 it was already declared a pandemic. The name consists of covid 19 ( by 2019 , year of the first case).
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