Instructions: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Input:  Naturally acquired human infection with B . mallei , although not seen in the United States since 1945 , has occurred rarely and sporadically among laboratory workers and those in direct contact with infected animals [ 2 ] .
Output:
B . mallei