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"in cases where a harmful virus threatens a large population of individuals who have poor access to vaccines, the idea of inoculating a few individuals with a vaccine that can spread like a virus might be nothing to sneeze at."

"A sexually transmitted vaccine would represent an alternate transmission pathway. For example, retransmittable vaccines could be given to individuals who come to clinics with respiratory and sexually transmittable viruses. The effect would be to introduce the vaccine to social networks of people who would otherwise have received virus. Developing optimal re-transmittable vaccines would require overcoming various engineering problems. However, a person might already, in principle, be able to inoculate another by sneezing after receiving Flumist, simply through mechanical transmission."

https://nypost.com/2021/04/20/herpes-infection-possibly-linked-to-covid-19-vaccine/


https://www.semanticscholar.org/paper/Tertiary-contact-vaccinia-in-a-breastfeeding-Garde-Harper/3a85aae92bb82f6979ea9c9f7cb713e255cd6aac

Tertiary contact vaccinia in a breastfeeding infant.
V. Garde, D. Harper, M. Fairchok
Published 2004
Medicine
JAMA

"On May 4, 2003, a US Army soldier received primary smallpox vaccination and experienced a primary uptake reaction at the inoculation site on days 6 through 8. The vaccinee reported observing all of the standard precautions to avoid household spread. In mid May, his breastfeeding wife developed vesicles on both areolas. On May 29, their infant daughter developed a papule on her philtrum. Contact vaccinia was confirmed by positive polymerase chain reaction and culture for vaccinia of both the maternal and infant lesions. This is the first documented case of inadvertent contact vaccinia transmission from a mother to her infant through direct skin-to-skin and skin-to-mucous membrane contact while breastfeeding. The mechanism of transfer from the vaccinee to the spouse is uncertain. This report demonstrates that breastfeeding infants living in close contact with smallpox vaccinees are at potential risk for contact vaccinia, even if the vaccinee is not the breastfeeding mother, and highlights the need for special precautions to prevent secondary transfer to breastfeeding mothers"