Strains of Viruses – Vaccine or Wild

Disney measles outbreak came from overseas, says CDC officials – NBC News
“similar to strains [of measles] found in Indonesia…”

WHO – Strains of Measles in Vaccines
“Many of the attenuated strains in use are derived from the Edmonston strain isolated in 1954, including the Schwartz, the Edmonston-Zagreb, and the Moraten strains. Other strains which are not derived from Edmonston strain include the CAM-70, TD 97, Leningrad-16, and Shanghai 191 (Ji-191) strains.”

Vaccine-Strain Measles Shedding (**biased source)

Vaccine Strain of Measles Virus found in Outbreaks – Dr. Suzanne Humpmhries guest article