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PubMed2001

[Treatment of bite wounds and cat-scratch disease].

Although rabies is the most serious consequence of animal bite injuries, in urban rabies-free countries the risk of rabies is far lower than the risk of bacterial infections of the wound. The most frequent etiologic cause of the wound infections after dog bites is Pasteurella multocida, as well as in the case of bites by cats, after which cat-scratch disease may also develop, its main cause being Bartonella henselae. All bite injuries must be carefully cleaned and disinfected; it is necessary to estimate the need of antirabies and antitetanus protection, and to introduce antibiotic treatment for prevention, particularly in the case of deep sting wounds caused mostly by cats.

Animals↗
PubMed1991

16S rRNA sequences of Bartonella bacilliformis and cat scratch disease bacillus reveal phylogenetic relationships with the alpha-2 subgroup of the class Proteobacteria.

The primary structures of 16S rRNAs of Bartonella bacilliformis, an isolate of the cat scratch disease (CSD) bacillus, and a strain phenotypically similar to the CSD bacillus were determined by reverse transcriptase sequencing. These microorganisms were found to be members of the alpha-2 subgroup of the class Proteobacteria. The sequence from B. bacilliformis was most closely related to the rRNA of Rochalimaea quintana (91.7% homology), the etiologic agent of trench fever. The sequence from the isolate of the CSD bacillus showed the greatest homology with Brucella abortus (89.7%) and, when compared with oligonucleotide catalog data, formed a cluster with Rhodopseudomonas palustris, Pseudomonas carboxidovorans, Nitrobacter species, and Bradyrhizobium species. The 16S rRNA sequence was also determined for the Cleveland Clinic isolate, which was previously shown to be phenotypically similar to and approximately 30% related, by DNA hybridization, to the CSD bacillus. The Cleveland Clinic isolate was isolated from a patient not diagnosed with CSD. The rRNAs from these bacteria exhibited 98.2% homology, confirming that this isolate is a second species in the same genus as the CSD bacillus. Our data suggest that neither B. bacilliformis nor the CSD bacillus is the etiologic agent of bacillary epithelioid angiomatosis.

Alphaproteobacteria↗
PubMed2005

Plasmacytoid monocytes in cat scratch disease with special reference to the histological diversity of suppurative lesions.

It has been suggested that plasmacytoid monocytes (PMOs) play an essential role in T-cell-dependent immune response. Indeed, numerous PMOs are found in close topographical association with epithelioid cell granulomas in hypersensitivity-type granulomas, such as tuberculosis and sarcoidosis. The key pathologic process in cat scratch disease (CSD) usually involves a B-cell-associated granulomatous reaction. Histologically, CSD appears to exhibit a histopathologic diversity, including suppurative lesions without epithelioid cell granulomas (early lesion), in which the microabscesses were surrounded by monocytoid B-cells (MBCs), suppurative granulomas containing MBCs (intermediate lesion), and suppurative granulomas without MBCs (late lesion). However, the presence or absence of PMO in CSD has not been studied previously. We examined 14 cases of CSD. In early lesions, numerous clusters of PMO were detected in the MBCs. In intermediate lesions, both MBCs and PMOs were found to be decreased in number, while late lesions contained no or only a few MBCs and PMOs. Overall, these findings suggest that PMOs may play a role in MBC-associated granulomatous response and in hypersensitivity granulomatous response. Moreover, the association with MBCs and PMOs indicates a functional relationship of MBCs with PMOs in the formation of suppurative lesions in CSD.

Abscess↗
PubMed2001

Enzyme immunoassay for the diagnosis of cat-scratch disease defined by polymerase chain reaction.

Whole-cell immunofluorescent antibody (IFA) tests for detection of anti-Bartonella henselae immunoglobulin (Ig) G are commonly used to diagnose cat-scratch disease (CSD). The need to cultivate B. henselae in Vero cells for antigen preparation and the absence of routinely applied IFA assays for IgM constitute the major disadvantages of this form of test. We describe the results of an enzyme immunoassay (EIA) for IgM and IgG that used N-lauroyl-sarcosine-insoluble outer membrane antigens from agar-grown B. henselae performed in 84 patients with definite CSD (regional lymphadenitis, cat contact, and > or =1 confirmatory test: polymerase chain reaction, skin test, or B. henselae culture). Although this method has been used as a diagnostic tool in several case reports, it has not previously been evaluated in a large study of definitively proven CSD cases. Results of this study indicate that the EIA described herein can play an important role in the serodiagnosis of CSD, although improvement of the sensitivity, particularly that of the IgM, would be desirable.

Adolescent↗