Instruments are the reason prion disease is handled differently from other infections in a hospital. The precautions are narrow, and knowing where they start and stop makes an operation easier to face.
Why are instruments the issue?
Because prions are hard to destroy. Standard cleaning and autoclaving, which deal with bacteria and viruses, do not reliably remove them. The agencies’ advice reflects that: the CDC says the safest course for a heat-resistant instrument that has touched high infectivity tissue is to destroy it, and sets out stronger chemical and heat methods where instruments are reused.
The tissues that count as high infectivity are the brain, the spinal cord and the eyes.
What does a hospital do?
In the UK, instruments used on high or medium risk tissue in a definite or probable case are either incinerated or quarantined, which means set aside for use on that same patient only. Where a diagnosis is still being worked out, instruments are held until it is settled. Instruments used only on other tissues are cleaned and returned to use as normal.
The CDC adds a practical step for theatre staff: instruments should be kept moist during a procedure rather than left to dry, because drying makes later cleaning harder. It also advises that instruments used in neurosurgery on a patient whose status is unknown be reprocessed as though CJD were suspected.
Will I be asked questions before an operation?
Possibly. UK guidance includes a separate assessment before surgery or endoscopy to identify people who have, or are at increased risk of, CJD. It is a short set of questions about past treatments such as dura mater grafts, pituitary hormone injections or an affected relative.
Being identified by that assessment does not mean an operation is refused. It means the team plans how instruments are handled.
Does this affect ordinary appointments?
No. Dental treatment should not be refused, and UK guidance says people with or at increased risk of CJD can be treated the same way as any member of the public. Blood tests, scans, physiotherapy and nursing care are unaffected.
Anything labelled single use is thrown away after one use, which is the rule for every patient.
I was told a past operation put me at risk. What now?
Ask the team that told you. They hold the detail of which procedure, which tissue and what follow-up applies, and they can ask the national prion service for advice. Your GP can arrange that conversation.
A small number of CJD cases decades ago were linked to instruments used in brain surgery, and none of that kind have been reported since decontamination procedures were improved in the 1970s. Iatrogenic CJD covers that history.
Where next
More detail covers the guidance annexes and the laboratory evidence on cleaning and sterilising. Care settings covers wards, care homes and home care. Tissue and organ donation covers donation. Is CJD contagious? answers the question families ask first, and the safety hub lists the rest. The laboratory version is decontamination, and official documents are tracked in the regulations atlas.