Yes: The percentage of full protection after a single dose runs about 85 % while a 2 dose series brings most up to over 95%. Imported cases from other countries represent our main risk of exposure, with an increasing problem of secondary cases in the unimmunized or partially immunized.
Answered 4/16/2019
4.2k views
Some do: Protection after one dose is estimated as 85% with a second dose raising that rate to >95%.Recent US outbreaks (Houston) have been linked to imported cases (air travel) that passed the germs to kids with only one dose or no vaccines.
Answered 5/1/2019
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