A patient who spent months in hospital because of a medical error received anonymous letters alleging safety concerns at the unit that treated her.
Marilyn Smith was diagnosed with tetanus after she was discharged following treatment for a leg injury at Hinchingbrooke Hospital in Huntingdon, Cambridgeshire.
She said the hospital had not checked that she had not been immunised.
The NHS trust that runs the hospital said it had apologised to her.
Ms Smith, 75, gashed her leg in a fall in her garden in Huntingdon in September 2021.
She said she was not asked about her tetanus immunisation status and was discharged from Hinchingbrooke without a booster shot.
The NHS vaccination guide, known as The Green Book, states that anybody born before 1961 needs to be asked this and given a booster if needed.
A few days later she woke up with trismus, commonly known as lockjaw, and was unable to open her mouth - a symptom of tetanus, which only a handful of people contract in the UK each year.
Ms Smith said: "I tried to clean my teeth but I couldn't get a toothbrush in my mouth.
"It was horrendous - it was just tightening and tightening like somebody had put a band on my jaw."
She subsequently spent more than 120 days in hospital in Hinchingbrooke, and then Peterborough, when her condition worsened and she was moved to critical care, placed in an induced coma and needed intubation.
She said she now struggled to walk.
"Prior to this I looked after my grandchildren, played...
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