Within the MMR II group, mumps titers of 134 to 300 AU/ml (n=8) were only found in those who were functionally immune or asymptomatic. All with mild COVID-19 symptoms had mumps titers below 134 AU/ml (n=17). All with moderate symptoms had mumps titers below 75 AU/ml (n=11). All who had been hospitalized and required oxygen had mumps titers below 32 AU/ml (n=5). 50 of them were known to have the MMR II vaccine while 30 were unclear.