There is not a single study proving unvaccinated children are a risk to the immune-compromised. What we do know is that anyone with cancer should NOT be around a recently vaccinated person because they shed live viruses for weeks.
https://healthchoicemn.org/live-virus-vaccines/
Mumps vax shedding:
http://www.ncbi.nlm.nih.gov/pu
http://www.ncbi.nlm.nih.gov/pubmed/16266774
Measles virus sheds for 1-13 days after vaccination:
http://www.ncbi.nlm.nih.gov/pm
Measles outbreak among the vaccinated:
http://www.ncbi.nlm.nih.gov/pu
Varicella transfer after vaccine to pregnant mom:
http://www.ncbi.nlm.nih.gov/pu
https://www.ncbi.nlm.nih.gov/m/pubmed/16769402/
http://m.jid.oxfordjournals.org/content/203/11/1542.full
Rotavirus vax shedding:
http://www.ncbi.nlm.nih.gov/pu
Mumps vax shedding:
http://www.ncbi.nlm.nih.gov/pu
https://www.ncbi.nlm.nih.gov/m/pubmed/16266774/
Vax Derived Polio Virus transmission:
https://www.ncbi.nlm.nih.gov/m
https://www.ncbi.nlm.nih.gov/m/pubmed/8228342/
There’s more where this came from, but you get the idea!
Blessings,
woketxmama