Original: Bartonella rochalimae is a recently discovered strain of Gram-negative bacteria in the Bartonella genus, isolated by researchers at the University of California at San Francisco (UCSF), Massachusetts General Hospital, and the United States Centers for Disease Control and Prevention.
Simplified: Bartonella rochalimae is a recently discovered strain of Gram-negative bacteria. The bacteria was found by researchers at the University of California, San Francisco.