Variant CJD and Surgery — House of Commons, 2016-11-29
Topic: Health
Nicola Blackwood (Conservative, Centre-right): I congratulate my hon. Friend the Member for Mole Valley (Sir Paul Beresford) on securing this important debate on variant CJD and surgery. It is clearly an area on which he has a great deal of knowledge. I recognise that prion disease is the causative agent of transmissible spongiform encephalopathies such as variant CJD. It remains in many ways obscure and there are many aspects of these rare diseases that we are still in the early stages of researching. However, one thing I am confident about is that the UK system for ascertaining CJD case numbers has been for the past 20 years reliable and accurate. Our national CJD research and surveillance unit, which is based in Edinburgh and funded by the Department and the Scottish Government, leads pan-European work and has leadership from expert clinicians and scientists who, in 1996 following BSE, were the first to identify variant CJD as a separate form of the condition. The Department recognises the potential seriousness of secondary—person-to-person—transmissions of vCJD and has since the late 1990s introduced a series of measures to reduce the risk of such spread, whether by blood transmission or by surgery. We are reassured that there have to date been no cases attributable to surgical transmission and only three cases of clinical disease attributable to blood transfusions, all of which occurred in or before 1999. However, our risk assessment models, which we use in our impact assessments of potential risk reduction measures, continue to take into account the potential for secondary—person-to-person—transmissions by both routes, in people with all genotypes and over potentially very long incubation periods, which my hon. Friend mentioned. This is why the scientific advice we have is that the surgical instrument measures in place are sufficient irrespective of the genotype My hon. Friend was right to mention the recent case. It was always anticipated on the basis of a wide body of published scientific work that, following the BSE epidemic, further cases of vCJD, including MV cases, might arise from time to time. We have seen that with similar diseases, such as kuru in Papua New Guinea, and studies suggest MV cases could be seen in small numbers for more than 30 years after exposure. Having reviewed the information about the case of vCJD in a patient with MV genotype, the Advisory Committee on Dangerous Pathogens has advised that no changes in the current risk reduction measures are needed at present. It advises that the measures in place are sufficient, irrespective of genotype, although of course the matter will remain under review It is important to stress that modern surgical equipment in the UK is very safe and that robust guidance is in place for the NHS on procedures and practices to reduce the risk of contamination of any kind, including the use of single-use instruments where possible and of decontamination practices. Where it is not possible to use single-use instruments in higher-risk procedures, there are processes in place to track the use of specialist equipment. As my hon. Friend will know far better than I do, there is a potential risk of vCJD transmission via dental surgery, and this has been recognised by the UK’s chief dental officers. In 2007, they issued letters to all dentists to advise that endodontic root canal reamers and files should be used as single-patient or single-use instruments.