The SARS-Cov-2 virus and its main effect, the Covid-19 pandemic, is unprecedented in its action - it is new to science, as was the SARS-Cov of 2003 - but it is in its form. expansion and infection dynamics. It shows analogies with other pandemics that humanity has suffered, especially in the last 50 years. What is its ultimate origin? Most pandemics are zoonotic in origin: viruses (or other microorganisms such as bacteria, protozoa, etc.) than normal
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