Well, if you believe the CDC. MMR vaccination rates in Mexico & Central America are higher then the US.
Do you believe the CDC?
From the CDC, yet Barry has allowed Illegal Immigrants to enter this Country and Schools without a SHRED of documentation.
“Only doses of vaccine with written documentation of the date of receipt should be accepted as valid. Self-reported doses or a parental report of vaccination is not considered adequate documentation. A healthcare provider should not provide an immunization record for a patient unless that healthcare provider has administered the vaccine or has seen a record that documents vaccination. Persons who lack adequate documentation of vaccination or other acceptable evidence of immunity should be vaccinated. “
http://www.cdc.gov/vaccines/pubs/pinkbook/meas.html