123. “Vaccine Information Statement | MMR Vaccine (Measles, Mumps, and Rubella): What You Need to Know,” Centers for Disease Control and Prevention, updated January 31, 2025, https://www.cdc.gov/vaccines/hcp/current-vis/downloads/mmr.pdf.

124. Merck Sharp & Dohme LLC, “Package Insert | M-M-R® II (Measles, Mumps, and Rubella Virus Vaccine Live),” US Food & Drug Administration, updated November 2024, p. 4–7, https://www.fda.gov/files/vaccines%2C%20blood%20%26%20biologics/published/Package-Insert-Measles-Mumps-and-Rubella-Virus-Vaccine-Live_2.pdf. 

125. ibid.

126. ibid.

127. ibid.