headaches, nausea, and diarrhea.After recovering, he twice tested negative for the virus in May. But at the end of that month, just 48 days after the first positive test, he tested positive again, this time with more severe symptoms, including a fever.
He was later admitted to a hospital after developing difficulties breathing and received supplemental oxygen.Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.When researchers, led by the Nevada State Public Health Laboratory (NSPHL), sequenced the virus particles in each of the positive test samples, they found substantial differences. For the virus that caused the first infection to mutate from one.