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 .