Does anyone 30+ ever remember hearing of friends or family getting hand/foot/mouth disease when we were kids?
Here is the scientific research about the connection between HFMD & Polio for your reference:
Exploring the Link between Polio Vaccination and Hand Foot Mouth Disease
http://epivax.com/news/exploring-the-link-between-polio-vaccination-and-hand-foot-mouth-disease?fbclid=IwAR311dmXAnox0RMYNVMCnSHSqQwpiYLKBVum2JfdPKNc4oGjX990VFtX2MQHand, foot, and mouth disease: current scenario and Indian perspective.
https://www.ncbi.nlm.nih.gov/m/pubmed/23442455/?fbclid=IwAR0UJvPz43QxbG2QpmqSUj7LW-PEOl5vw--NMyRbL7KOtrpBnyC1gY-zqxgCoxsackievirus
Is Hand, Foot, and Mouth Disease Really a Big Deal?
https://www.livingwhole.org/hand-foot-mouth-disease-really-big-deal/?fbclid=IwAR11msGaBro-b7KVyMWecx6z3Z1E31e8mzHvXQ6n7S_Ki-kPfB6tCbz7Gs8
[An investigation on a case of hand-foot-mouth disease caused by coxsackie-virus A6 associated with a vaccine-derived poliovirus co-infection].
https://www.ncbi.nlm.nih.gov/m/pubmed/24685040/?fbclid=IwAR3FGpCocKWMwEmqiAG1s6FEOCp1XGk6TdoXhMqF2iBi_qm5az_1D7lPwiU
Polio, Foot and Mouth Disease, and Hepatitis A: The Picornaviridae Virus Family
https://study.com/academy/lesson/polio-foot-and-mouth-disease-and-hepatitis-a-the-picornaviridae-virus-family.html?fbclid=IwAR31QF4SkOn6KkgsUoyz0XMC0JZUNcFn5nEaL2NgFsQnDJdjKmGUX3zl9H8
Non-Polio Enteroviruses