A perplexing" Canadian study linking H1N1 to seasonal flu shots is throwing national influenza plans into disarray and testing public faith in the government agencies responsible for protecting the nation's health. Distributed for peer review last week, the study confounded infectious-disease experts in suggesting that people vaccinated against seasonal flu are twice as likely to catch swine flu. The paper has since convinced several provincial health agencies to announce hasty suspensions of seasonal flu vaccinations, long-held fixtures of public-health planning. "It has confused things very badly," said Dr. Ethan Rubinstein, head of adult infectious diseases at the University of Manitoba. "And it has certainly cost us credibility from the public because of conflicting recommendations. Until last week, there had always been much encouragement to get the seasonal flu vaccine." On Sunday Quebec joined Alberta, Saskatchewan, Ontario and Nova Scotia in suspending seasonal flu shots for anyone under 65 years of age. Quebec's Health Ministry announced it would postpone vaccinations until January. B.C. is expected to announce a similar suspension during a press conference Monday morning. Other provinces, including Manitoba, are still pondering a response to the research. Dr. Rubinstein, who has read the study, said it appears sound. "There are a large number of authors, all of them excellent and credible researchers," he said. "And the sample size is very large - 12 or 13 million people taken from the central reporting systems in three provinces. The research is solid."