<p>TAIPEI, Taiwan — Canadian officials conceded that precautions at Toronto hospitals weren't enough to prevent new SARS (search) infections, while Hong Kong researchers said a vaccine for the highly contagious respiratory disease is ready for testing on animals.Since emerging in November in southern China, the virus has infected more than 8,200 people worldwide. Taiwan on Tuesday reported 11 new cases and four deaths, bringing the global death toll to at least 729.</p>