Cases: From PasadenaNOW: Los Angeles County public health officials on Friday cautioned of a new COVID-19 “variant of interest,” known as the Mu variant, that’s been detected in the county. The Mu variant, which was first identified in Colombia in January and since spread to 39 countries, has been linked to 167 COVID-19 infections in L.A. County between June and August, according to the Los Angeles County Department of Public Health.