Reply to Marakasova and Baranova, "MMR Vaccine and COVID-19: Measles Protein Homology May Contribute to Cross-Reactivity or to Complement Activation Protection".

Marakasova and Baranova make a good, incremental step trying to explain the results of our paper, “Analysis of Measles-Mumps-Rubella (MMR) Titers of Recovered COVID-19 Patients” (1). We believe the predictable waning of mumps IgG titers over time allows mumps titers to serve as a proxy measure of overall MMR II vaccine persistence. Even though we observed a significant inverse correlation only with mumps virus titers, any of the components of MMR II alone or …