This claim has not been substantiated and is probably not credible. None of these allegations have been independently substantiated. This is not substantiated by any known evidence. Further, human infections have been substantiated, with conclusive reports from Italy. It reported evidences that substantiated some of the criticisms. This claim cannot be substantiated due to a lack of reliable evidence. Irwin said that Navarro had not substantiated his claim with any evidence. However, these rumors and allegations were never substantiated beyond tabloid media accounts. These claims could not be substantiated. According to "Newsweek", these allegations are poorly substantiated and lack credibility. Four of those allegations were substantiated by an independent review board. None of this is substantiated by contemporaneous documentation. In most instances statements are not substantiated by any historical references. However, his claims were never substantiated. To date, these claims have not been substantiated.