The only potentially relevant bit of science to come out of all this is the Imboden, Canter Cluff paper on recovery from influenz
At least from the abstract we see they studied Brucellosis and Chronic Brucellosis. There is now evidence from a recent study (2009), of ongoing infection.
In the current study, we evaluated the usefulness of Q-PCR in the diagnosis and follow-up of chronic brucellosis patients. We studied a cohort of 35 subjects with a history of brucellosis diagnosed between 2 and 33 years previously. The most significant characteristic of infection was the long-term persistence of B. melitensis DNA in nonfocal-disease patients complaining of nonspecific symptoms undiagnosable by classical methods. This observation is very important insofar as it offers hope to a not insignificant group of patients who wander from physician to physician, remaining undiagnosed even though their symptoms (weakness, easy fatigability, anxiety, nervousness, and vague aches) persist. In such situations, Q-PCR could help physicians to diagnose chronic infection.
But I bet there are a myriad of things wrong with the paper. I.e. Brucellosis can infect the CNS, probably increasing depression and it is the CNS infection, not the depression that coincides with increased probability of getting the chronic form.
Chronic brucellosis also has clear biological symptoms - from the mayo clinic
Long-term signs and symptoms may include fatigue, recurrent fevers, arthritis, swelling of the heart (endocarditis) and spondylitis — an inflammatory arthritis that affects the spine and adjacent joints.