Answer
It is likely that Dr. Taylor did not request a culture because the F. tularensis bacteria is notoriously difficult to culture. Additionally, the handling of this bacteria could pose a threat to any scientists who would be tasked with drawing up a culture. Finally, there is little need for a culture anyway, as the disease can often be diagnosed through patient history and presenting symptoms. These reasons likely helped Dr. Taylor decide against a culture request.
Work Step by Step
It is likely that Dr. Taylor did not request a culture because the F. tularensis bacteria is notoriously difficult to culture. Additionally, the handling of this bacteria could pose a threat to any scientists who would be tasked with drawing up a culture. Finally, there is little need for a culture anyway, as the disease can often be diagnosed through patient history and presenting symptoms. These reasons likely helped Dr. Taylor decide against a culture request.