just something to think about . the virus covid is
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Human Coronavirus Types
Coronaviruses are named for the crown-like spikes on their surface. There are four main sub-groupings of coronaviruses, known as alpha, beta, gamma, and delta.
Human coronaviruses were first identified in the mid-1960s. The seven coronaviruses that can infect people are:
Common human coronaviruses
1.229E (alpha coronavirus)
2.NL63 (alpha coronavirus)
3.OC43 (beta coronavirus)
4.HKU1 (beta coronavirus)
Other human coronaviruses
5.MERS-CoV (the beta coronavirus that causes Middle East Respiratory Syndrome, or MERS)
6.SARS-CoV (the beta coronavirus that causes severe acute respiratory syndrome, or SARS)
7.SARS-CoV-2 (the novel coronavirus that causes coronavirus disease 2019, or COVID-19)
People around the world commonly get infected with human coronaviruses 229E, NL63, OC43, and HKU1.
Sometimes coronaviruses that infect animals can evolve and make people sick and become a new human coronavirus. Three recent examples of this are 2019-nCoV, SARS-CoV, and MERS-CoV.
source
https://www.cdc.gov/coronavirus/types.html