Thank you very much, Mr. Chair and committee members, for the opportunity to discuss the blood donor eligibility criteria for MSM.
As you are aware, this is a sensitive and emotionally charged topic involving the people on both sides of the donation experience: the blood donor wishing to contribute to Canada's blood system and the patient receiving the blood product.
I'll begin by briefly reviewing how we screen blood donors and then provide an overview of the risk assessment and blood testing. I'd also like to outline some of the historical context around MSM and HIV risk as it affects the blood system, touch on what other blood operators are doing internationally, and then discuss the effect of changes to these eligibility criteria on the blood supply.
My colleague, Dr. Devine, will then conclude with an overview of our specific next steps.
As you are well aware, in Canada, blood is regulated as a drug by Health Canada. This means that Canadian Blood Services must demonstrate that the changes to policies and procedures potentially affecting patient safety will not introduce any measurable additional risk to the blood supply system before we receive federal approval for adoption.
Before donating blood, donors are screened to ensure blood donation is safe for them and for the patients who will receive their products. Donors must first complete a questionnaire, and we expect donors to be honest about their exposure risks. Screening personnel then go over the donor's answers and perform additional assessments to determine whether the donor is eligible to donate. Based on their answers, donors are then separated into broad risk categories and are determined to be either eligible or ineligible to donate accordingly.
Donors may be ineligible to give blood for a varying and large number of reasons, including travel, vaccination, tattoos, and many lifestyle issues. This leads me to how we assess risk.
The eligibility criteria presented on the donor questionnaire are determined through multiple risk assessments related to transmissible diseases. As part of this process, Canadian Blood Services monitors transmissible disease testing in blood donations and investigates possible transfusion-transmitted infections in recipients of blood products. We also continually scan the international and domestic environment for emerging pathogens, including, most recently, the Zika virus.
Our risk models are informed by data related to pathogens of interest or related pathogens. We also consider data from population-based studies, such as those performed by the Public Health Agency of Canada. After any significant change to our donor eligibility criteria, we use anonymous surveys to assess the rate of our donors' compliance with the revised donor questions.
We certainly receive many questions from donors about our criteria and why, if we can test blood, we need to have these criteria in the first place. Canadian Blood Services does indeed test every donation for HIV-1 and HIV-2, hepatitis B, hepatitis C, human T-lymphotropic viruses I and II, and syphilis. We also test for Chagas disease on individuals identified as being at risk based on travel, and in the spring, summer, and fall months we also test for West Nile virus.
While our technology is indeed sophisticated and includes state-of-the-art nucleic acid testing, there is a brief period shortly after infection when pathogens are not detectible by current assays. If an individual donates blood during the so-called “window period”, the early stages of infection, our testing processes would not detect the virus, and the blood products manufactured from that donation could be infectious for patients. This window period is indeed now less than 10 days for HIV and hepatitis C, and less than two months for most other pathogens. No test is 100% perfect, however, and can fail for technical reasons or because the pathogen undergoes mutation.
Because of the history of the blood supply system in Canada in the tainted blood tragedy, changes to donor eligibility criteria for MSM have required substantial analysis and ongoing engagement with patient stakeholder groups, including the LGBT communities and many other organizations, to make sure we maintain public trust in the system. When Canadian Blood Services was first established in 1998, on the the heels of the tainted blood tragedy, the criteria for MSM were indeed stringent. If a man had had sex even one time with another man since 1977, he was permanently deferred and ineligible to donate blood. At that time, and for many years following, the MSM population was noted to be a particularly high-risk group. The year 1977 was chosen as ground zero for the arrival of HIV in North America, hence its inclusion in the criteria.
We moved, as the committee well knows, to a policy for a five-year deferral in July 2013. Following our application to make this change, Health Canada asked of Canadian Blood Services and Héma-Québec that we gather a minimum of two years' data to demonstrate that no further risk had been introduced to the blood system before requesting a further reduction in the waiting period for MSM. This was met without issue.
Our data showed that the current one-year deferral policy easily covers the window period for HIV, hepatitis B, and hepatitis C, with the residual risk for these three pathogens being less than one in one million units transfused. Similarly, post-implementation monitoring showed no adverse impacts on the prevalence of HIV in donors, donor compliance, or trust in the system. This data permitted Canadian Blood Services to submit a further application to Health Canada for what is now our one-year deferral policy. This past June, that was approved and took effect in August.
Still, according to the Public Health Agency of Canada's most recent figures, men who have sex with men account for 54% of new HIV infections in Canada, a higher proportion than other risk categories combined. Large cohort studies of MSM populations in Canada also show a high frequency of risk-related behaviours. The scientific evidence available, however, is inadequate. Most public health research has focused on individuals within the MSM population whose behaviours are considered high-risk for infectious disease. This is the evidence that has informed policies to date. There is little data for those with low risk, such as those in long-term monogamous relationships. New research must be done to generate the evidence required for low-risk groups to be identified and included as eligible donors without introducing risk to the blood system.
Because patterns, causes, and effects of HIV differ by country, there is no international scientific consensus on an optimal deferral policy. With our move to a one-year ineligibility period for MSM, we are asked what impact this will have on the adequacy of Canada's blood supply. Unfortunately, we don't have clear data there yet. After the change from permanent ineligibility to a five-year waiting period, about 100 donors who had previously been ineligible to donate due to having sex with another man returned to donate and were reinstated. Similarly, findings of the post-implementation compliance survey following the five-year deferral suggest that about 400 male donors who had had sex with a man after 1977 but at least five years ago would be eligible to donate annually.
A larger impact on supply may be related to how Canadian Blood Services is perceived by potential donors, particularly younger people who are most concerned about issues of social justice. This is why Canadian Blood Services makes extensive outreach to many organizations, including students, through campus presentations, and many meetings with interested groups. We acknowledge that frustration remains high amongst many stakeholder groups whose members feel that the most recent change to the eligibility criteria did not go far enough to address what they perceive as discrimination.
Our current one-year deferral for MSM is indeed only an incremental step towards more inclusive donor criteria. We recognize that the pace of change for many is frustratingly slow for the vast majority of MSM who are still unable to donate blood under the current criteria. We remain very grateful for the stakeholder collaboration and participation from across the spectrum of organizations, including the Canadian AIDS Society.
Dr. Devine will now briefly take you through the next steps of what lies ahead in terms of future potential changes to the MSM criteria.