Bartonella (formerly known as Rochalimaea) is a genus of Gram-negative bacteria. Facultative intracellular parasites, Bartonella species can infect healthy people but are considered especially important as opportunistic pathogens.[1] Bartonella are transmitted by insect vectors such as ticks, fleas, sand flies and mosquitoes. At least eight Bartonella species or subspecies are known to infect humans.[2] In June 2007, a new species under the genus, called Bartonella rochalimae, was discovered.[3] This is the sixth species known to infect humans, and the ninth species and subspecies, overall, known to infect humans.

http://en.wikipedia.org/wiki/Bartonella

On a serious note, I do think any country, wants to protect it's public from fear. Also no test is accurate for this type of thing. Unless a person has a brain biospy. But even at that level how accurate with be the labs?