By DEBORAH and GARY STETLER September 15, 2021 â Officials announced today that a long feared development has occurred, which is the isolation of a vaccine-resistant variant of COVID-19-Delta. This new vaccine-resistant, highly infectious variant was isolated in Mesa County and is called MC-Delta. Unfortunately, currently available vaccines do not prevent infection by MC-Delta. Infectious disease experts state that this is a predictable outcome from the situation in Mesa county: widespread community transmission and partial vaccination of the population. â â â We have a chance to prevent a press release like the (imaginary) one above. And yet we are at real risk of being outsmarted by an unthinking virus, not even able to reproduce itself without infecting another being. How could this happen?