Studies on the Chicken Pox & Shingles Vaccines
"Varicella vaccination is less effective than the natural immunity that existed in prevaccine communities. Universal varicella vaccination has not proven to be cost-effective as increased HZ (shingles) morbidity has disproportionately offset cost savings associated with reductions in varicella disease. Universal varicella vaccination has failed to provide long-term protection from VZV disease."
Stroke after varicella vaccination.
Two children presented with acute hemiparesis 5 days and 3 weeks following varicella vaccination. Both showed unilateral infarction of the basal ganglia and internal capsule, a distribution consistent with varicella angiopathy. Both children had small patent foramen ovale (PFO), and one child also had severe iron-deficiency anemia, which may have predisposed the patient to this adverse effect.
"Analysis of 36 individuals over age 60 years who were immunized with Zostavax revealed varicella zoster virus DNA in swabs of skin inoculation sites obtained immediately after immunization in 18 (50%) of 36 subjects and in saliva collected over 28 days in 21 (58%) of 36 subjects. Genotypic analysis of DNA extracted from 9 random saliva samples identified vaccine virus in ALL instances. In some immunized individuals over age 60, vaccine virus DNA is shed in saliva up to 4 weeks."
"Zostavax contains live attenuated VZV, and the package insert warns newly vaccinated individuals to avoid contact for an unspecified time with newborn infants, immunosuppressed individuals, and pregnant women who have not had chicken pox or have not been immunized for chicken pox. Because VZV DNA is present in saliva of zoster patients for at least 2 weeks  and VZV in saliva can also be infectious , we examined the inoculation site and saliva of Zostavax-vaccinated subjects for the presence of VZV DNA for 4 weeks after immunization"
FULL TEXT http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3096786/
"Healthcare workers born after 1980 were 20 times (95% CI: 11.0 to 37.2) more likely to be susceptible to measles, and 2 times (95% CI: 1.2 to 3.2) more likely to be susceptible to varicella than those those born before 1965. CONCLUSIONS:The susceptibility to measles in healthcare workers in our centre is higher in younger cohorts, with values higher than expected in a community with high vaccination coverage against measles, mumps, rubella vaccine (MMR) in the paediatric population for many years." 2012