Though mu has mutations suggesting that it might be more transmissible and could evade the antibodies produced by the current vaccines, that has yet to be confirmed.
With 53% of all residents fully vaccinated, Pennsylvania is only slightly ahead of some states hit hard by delta.
The CDC estimates that the Delta variant may be responsible for nearly 10% of all new COVID-19 infections in the United States. In some Western U.S. states, the variant may be responsible for nearly 20% of cases.
By Leila Fadel/NPR Questions remain about the efficacy of vaccines against COVID-19 variants and how long immunity lasts
By Merideth Bucher 
