Winnipeg, and the transfer of viruses to a research facility in Wuhan are too sensitive to hand over to the special committee on Canada-China relations, Health Minister Patty Hajdu said Monday.“In this particular case, the information requested has both privacy and national security implications,” Hajdu said. “Compliance with the order without proper safeguards in place would put sensitive information at the risk of public release.” 2 Pfizer COVID-19 vaccines more effective than AstraZeneca against Delta variant, data says The Conservatives have been pushing the Liberal government — and the Public Health Agency of Canada — to shed more light on why two scientists, Xiangguo Qiu and her biologist husband, Kending Cheng, were escorted out of.