On 2017 Jun 14, Jean-Jacques Letesson commented:

To my knowledge this is the first reported bacteriologicaly positive case of Brucella infection into the eye.

Existing information on uveitis and other affections of the eye structure suggest that these are not so rare complication of brucellosis. Depending on the series, up to 50% of patients (B. melitensis) can show some of these troubles (early observations are in Dalrymple-Champneys, W., 1960. Brucella Infection and Undulant Fever in Man. Oxford University Press, London, pp. 88; also, in a recent work done in an endemic area, about 20% of the patients showed these complications: Gulten Karatas, Set al 2009. Canadian Journal of Ophthalmology 44, 598–601). However, Brucella has never been isolated from enucleated human eyes to confirm the diagnosis (Brucellosis. M. Monir Madkour. ISBN 0-7236-0941-1)

This ocular localization could be related to the presence of aldose reductase (AR) in these organs. Aldose redutase being probably involved (among other function) in the production of erythritol the favorite carbon source of Brucella. (Erythritol Availability in Bovine, Murine and Human Models Highlights a Potential Role for the Host Aldose Reductase during Brucella Infection Front. Microbiol., 13 June 2017 | https://doi.org/10.3389/fmicb.2017.01088)

Actualy, lens and retina while not being described as being a site of high AR expression, have also been analyzed for AR content because the expression of AR is induced by high glucose or osmotic stress and because of the role of the polyol in diabetic cataract or retinopathy.

On 2017 Jun 14, Jean-Jacques Letesson commented:

To my knowledge this is the first reported bacteriologicaly positive case of Brucella infection into the eye.

Existing information on uveitis and other affections of the eye structure suggest that these are not so rare complication of brucellosis. Depending on the series, up to 50% of patients (B. melitensis) can show some of these troubles (early observations are in Dalrymple-Champneys, W., 1960. Brucella Infection and Undulant Fever in Man. Oxford University Press, London, pp. 88; also, in a recent work done in an endemic area, about 20% of the patients showed these complications: Gulten Karatas, Set al 2009. Canadian Journal of Ophthalmology 44, 598–601). However, Brucella has never been isolated from enucleated human eyes to confirm the diagnosis (Brucellosis. M. Monir Madkour. ISBN 0-7236-0941-1)

This ocular localization could be related to the presence of aldose reductase (AR) in these organs. Aldose redutase being probably involved (among other function) in the production of erythritol the favorite carbon source of Brucella. (Erythritol Availability in Bovine, Murine and Human Models Highlights a Potential Role for the Host Aldose Reductase during Brucella Infection Front. Microbiol., 13 June 2017 | https://doi.org/10.3389/fmicb.2017.01088)

Actualy, lens and retina while not being described as being a site of high AR expression, have also been analyzed for AR content because the expression of AR is induced by high glucose or osmotic stress and because of the role of the polyol in diabetic cataract or retinopathy.