Many people including her had mild childhood cases that went undiagnosed only to have it come back in a non-contagious form even decades later & wreaking havoc on them.
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I’m sorry. It sounds like she had a good life, until the polio.
We were dating when it hit her. I went from married to widower {via of a massive heart attack} to married and caregiver within literally 6 months. She passed in 2015 at the age of 64. Pneumonia had set in and 30 years of contortion on her body took it's toll.
She was on a vent for her last 3 weeks. Vents is what took the place of Iron Lungs. Long term wise they do not send a patient home on a Vent and only a handfull of facilities in the USA accept long term Vent patients. The nearest one was almost 500 miles in West Virginia.