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The World Health Organization (WHO) has compiled a list of questions and answers that address most if not all of the questions you may have. Of note is that although the symptoms of COVID-19 are generally considered to be mild, 1 in 5 of those afflicted with the disease require hospitalization. That's 20 percent for those of us who may be mathematically challenged.
Additionally, according to WHO, there is no evidence that current medicine exists that can cure or prevent the disease.
Considering that the disease is still spreading across the world with no real end in sight, the concern about COVID-19 is, and please pardon this pun which may be in bad taste, "nothing to sniff at."