Cat Scratch Disease in kidney transplant receptors : is it a rare or underdiagnosed pathology ?

A 16 year-old boy was born with a posterior urethral valve, vesico-uretheral reflux and a severe bilateral renal dysplasia. He was submitted to a gastrocystoplasty and a bladder catheterization was intermittently performed. He had initiated on CAPD in the first year of life, being submitted to cadaveric renal transplantations with 5 and 12 years-old. Currently he is being Cat Scratch Disease in kidney transplant receptors: is it a rare or underdiagnosed pathology?


Case report
A 16 year-old boy was born with a posterior urethral valve, vesico-uretheral reflux and a severe bilateral renal dysplasia.He was submitted to a gastrocystoplasty and a bladder catheterization was intermittently performed.He had initiated on CAPD in the first year of life, being submitted to cadaveric renal transplantations with 5 and 12 years-old.Currently he is being Cat Scratch Disease in kidney transplant receptors: is it a rare or underdiagnosed pathology?Doença da Arranhadura do Gato em transplantados de rim: patologia rara ou subdiagnosticada?
Cat Scratch Disease (CSD) is an infectious disorder which appears after cat scratching particularly in children and adolescents.Bartonella henselae is the etiologic agent more frequently involved.There are only a few recent reports demonstrating the disease after transplantation, although the illness is not infrequent in immunologically competent people.Indeed CSD in transplant receptors has only been recently emphasized in the literature and it was concluded that fever and lymphadenopathy in patients who had been exposed to cats should prompt clinicians to maintain a suspicion for the infection.In this report CSD infecting a renal transplanted adolescent complaining of headache, blurred vision and fever, presenting a cat scratching lesion in the right arm, with a bilateral painful cervical lymphadenopathy was related.He also presented indirect immunofluorescency identifying that the two subtype's titles of Bartonella-henselae and quintana-were elevated.Treatment with doxicicline e rifampicin was introduced and the patient became asymptomatic in about 3 weeks.abstraCt Keywords: adolescent; health care (public health); immunosuppression.
Urine and blood cultures were negative.EB virus, toxoplasmosis, cytomegalovirus, fungi and tuberculosis were also non-reagents.Liver function tests were within normal limits and the sedimentation rate was 32 mm.Indirect Bartonella IgM immunofluorescency was < 1:20 (normal < 1:16) and IgG 1:256 (normal < 1:64).Indirect immunofluorescency to identify the subtypes of Bartonella species was done.Bartonella henselae title was 1:2048 and Bartonella quintana equals 1:1024, both elevated.An abdominal CT showed increased liver size and splenomegaly, with no focal parenchymal lesions.Patient was evaluated by an ophthalmologist.Posterior uveitis in both eyes with papilledema and right eye hemorrhages were seen in the retinography (Figure 1).A supraclavicular lymph node biopsy demonstrated a pyogenic necrotizing adenitis, suggestive of CSD (Figure 2).Warthin-Starry method allowed visualizing the pleomorphic bacilli (Figure 3).Treatment with doxicicline e rifampicin was introduced and fever decreased 14 days after, headache disappeared nine days later and hepatospleno -lymphadenomegaly were not found at physical examination 2 months afterwards.Antibiotic therapy was maintained during 6 months.

DisCussion
Cat Scratch Disease (CSD) is an infectious disorder which appears after cat scratching particularly in children or young adults. 1 Bartonella henselae is the etiologic agent more frequently involved. 2n immunologically competent individuals the disease is benign and self-limited. 3It has also been recognized in AIDS patients, 4 but there are only a few reports demonstrating the disease after kidney   transplantation.Indeed the issue has been recently emphasized in the literature and it was concluded that fever and lymphadenopathy in patients who had been exposed to cats should prompt clinicians to maintain a suspicion for B. henselae infection. 2,5n this report CSD infecting a renal transplanted adolescent is presented.
Parinaud, in 1931, was the first to describe conjunctival inflammation with lymphadenopathy after contact with an animal.Debré was the first to observe the occurrence of a regional lymphadenopathy after a cat scratch. 6Bartonella henselae or more rarely Bartonella quintana were identified as the causal agents of the disease in 1992. 7he illness occurs more frequently in the autumn and at the beginning of the winter. 8Lymphadenomegaly is the most common manifestation and appears two weeks after the inoculation and almost 15% of the lymph nodes were found to be suppuratives.About 30% of the patients had fever above 38.5 °C, headache and malaise.Lymphadenopathy localization depends on the site of inoculation.The most common affected sites are axilla, epitrochlea, neck, supraclavicular and submandibular areas. 9In the first few weeks of disease sedimentation rate is usually increased. 1Acute renal transplantation rejection reaction was also associated with CSD. 10 Ocular manifestations include neuroretinitis which is a syndrome presenting decreased visual acuity producing optical nerve edema associated with macular exudates.Funduscopy alterations may result from vasculitis through direct vessels invasion by the bacteria. 11Those presenting neuroretinitis usually had fever, malaise and unilateral blurred vision. 12Ophthalmologic examination usually discloses a unilateral involvement with diminished visual accuracy and afferent papillary defect.Retinal abnormalities may include hemorrhages, cotton wool exudates, multiple retina lesions and exudates.
Differential diagnosis must include toxoplasmosis, malignant diseases-lymphoma and metastasis, granulomatous disease, tuberculosis, sarcoidosis and other infectious disease-pyogenic abscess and fungal infections.
CSD diagnosis has been based in the following findings: (A) Cat contact with a scratching lesion; (B) Negative serum tests for other causes of adenopathy, Bartonella positive Polymerase Chain Reaction and liver-splenic lesions in the CT.(C) Bartonella henselae positive serology (Elisa or Indirect Immunofluorescence) with a titer equal or greater than 1: 64 and (D) a biopsy showing granulomatous inflammation consistent with CSD or with a positive Warthin-Strarry coloration for the bacilli. 1 The reported patient presented all the required diagnosis criteria.
As previously related a rare significant cross reaction occurred for IgG between B. henselae and B. quintana specimens, as occurred in the reported patient. 13owever, serology still remains the most widely used method for the diagnosis of CSD because culture and isolation are difficult to perform and are not yet easily available.Using indirect immunofluorescency, an IgG titer above normal limits-as occurred in our patientmust be considered positive for CSD. 14istopathology of the involved lymph node demonstrated a lymphoid hyperplasia with acellular and necrotic centers, peripheral hystiocytes and lymphocytes around them suggestive of CSD and the positive Warthin-Starry test which showed small pleomorphic bacillus.Biopsy findings depend on the time of disease presentation.At the beginning they may demonstrate lymphoid hyperplasia, arteriolar proliferation and reticular cells hyperplasia.Subsequently granulomas appear, usually with central necrosis and giant multinucleated cells.Lately star-like infiltrates become visible: these are not pathognomonic but very specific. 1reatment, especially for neuroretinitis, was initiated with doxicillin and rifampicin.The need for antibiotic therapy in immunocompetent individuals is not well established.However, in the immunosuppressed, antibiotics are formally indicated, improving the prognosis.
As CSD is not frequently described in immunosuppressed transplanted individuals-contrarily to what has been seen in immunocompetent people-this report would help physicians to become aware of this diagnosis, including it in the extensive list of opportunistic agents causing infection in the post-transplant phase.And finally the question: Cat Scratch Disease in kidney transplant receptors: is it a rare or still an under diagnosed pathology?

Figure 1 .
Figure 1.Retinography: Posterior uveitis in both eyes with papilledema and right eye hemorrhages.