During measles outbreaks, it is important to be able to rapidly distin-guish between measles cases and vaccine reactions to avoid unnecessary outbreak response measures such as case isolation and contact investigations.
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Endemic transmission of measles virus (MeV) was interrupted in the Americas in 2002(1), but since then, importations of measles from areas of endemicity have caused frequent and sometimes large outbreaks (2–6) and a recent transitory suspension of the elimination status (7).
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Genotyping is used to confirm the origin of an outbreak and to exclude endemic circulation, but it is also the only way to distinguish vaccine strains from wild-type viruses.
Source: https://jcm.asm.org/content/jcm/55/3/735.full.pdf
What is being said in the above article is that they can now use Genotyping to determine if a measles outbreak like the ones currently going on are measles as a result of the vaccine or if it is from the actual disease virus itself. What is not being said is that the MMR II vaccine sheds for a period weeks. That is why when you receive that vaccine it is recommended that you do not go around immune compromised, pregnant women, or babies for a period of 28 days so that they don’t get the measles from you shedding the virus. Look it up on the actual package insert file below and download it.
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