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PubMed1952

Cat-scratch fever.

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Bartonella Infections↗
PubMed1998

Hypercalcemia due to endogenous overproduction of active vitamin D in identical twins with cat-scratch disease.

CONTEXT: The extrarenal synthesis of active vitamin D sterols has a central causative role in the hypercalcemia associated with various granulomatous diseases. OBJECTIVE: To study the calcium metabolism in patients with cat-scratch disease who have hypercalcemia. DESIGN: Case report. SETTING: University hospital in Barcelona, Spain. PATIENTS: Two identical twins who developed asymptomatic hypercalcemia during the acute phase of cat-scratch disease. MAIN OUTCOME MEASURES: Serial measures of calcium homeostasis and metabolism over a 2-month period. RESULTS: On admission and 6 and 7 days later, both patients were found to have increased levels of serum and urinary calcium, serum phosphate, and serum 1,25-dihydroxyvitamin D [1,25(OH)2D], whereas they had normal values of serum 25-hydroxyvitamin D and urinary cyclic adenosine monophosphate and decreased serum concentrations of intact parathyroid hormone. Sixteen and 20 days after admission, these abnormalities had resolved without treatment. A direct correlation was observed between the serum 1,25(OH)2D levels and both the serum and 24-hour urinary calcium concentrations. Also, the concentrations of calcium and 1,25(OH)2D paralleled the clinical activity of the infectious disease over the period these parameters were measured. CONCLUSIONS: Our cases provide evidence that cat-scratch disease can produce hypercalcemia through the unregulated production of the metabolite 1,25(OH)2D. Cat-scratch disease should be added to the list of granuloma-forming diseases that are responsible for 1,25(OH)2D-mediated hypercalcemia.

Adolescent↗
PubMed1995

Detection of mip-like sequences and Mip-related proteins within the family Rickettsiaceae.

The Mip surface protein, a prokaryotic analog of the FK506-binding proteins, enhances the ability of Legionella pneumophila to infect macrophages and protozoa. Using mip-specific probes and low-stringency Southern hybridizations, we have detected DNA sequences homologous to mip within Coxiella burnetii and Rochalimaea quintana. Using specific anti-Mip antisera and immunoblot analysis, we also detected Mip-related proteins within these bacteria as well as within Rickettsia and Ehrlichia species. These data suggest that Mip-related proteins have broad significance for host-parasite interactions. However, they also indicate that care must be exercised when using mip probes or anti-Mip antibodies for the detection of Legionella organisms in water or clinical samples.

Bacterial Proteins↗