Bartonella henselae lymphadenitis, or cat-scratch lymphadenitis (CSL), is classically associated with stellate microabscesses, occasional giant cells, and extension of the inflammatory infiltrate into perinodal soft tissue. Availability of B. henselae molecular testing on tissue specimens has broadened our understanding of the morphologic variation in this disease. Here we sought to describe the histopathologic features of the largest series to date of molecularly proven CSL. B. henselae polymerase chain reaction-positive tissue specimens from 2010 to 2012 were identified, and hematoxylin and eosin slides were reviewed. A single-step 16S-23S rRNA-based polymerase chain reaction testing was used to identify B. henselae on formalin-fixed, paraffin-embedded tissues. A total of 100 B. henselae-positive cases were identified. The median age of the patients was 26.5 years (range, 1 to 69 y). Ninety-two percent of cases presented in lymph nodes, with 66% of these occurring above the diaphragm, most commonly in the cervical chain. Of 100 cases, 57 had classical CSL features of necrotizing granulomas with microabscesses, with or without surrounding palisading histiocytes. In contrast, 43/100 cases lacked the prototypical microabscesses of CSL including: 23 cases (53.5%) with features of fungal/mycobacterial lymphadenitis, 6 (14%) cases with features of Kikuchi lymphadenitis, and 4 cases (9.3%) with the classic histologic triad of toxoplasma lymphadenitis. In summary, B. henselae lymphadenitis may lack the typical microabscesses in almost half of cases and may closely mimic other reactive, especially infectious, lymphadenopathies. Given the lack of specificity of many of these features, a low threshold for B. henselae molecular testing on tissue is warranted in the appropriate clinical context.
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http://dx.doi.org/10.1097/PAS.0000000000000552 | DOI Listing |
Methods Mol Biol
December 2024
Department of Chemistry, North Carolina State University, Raleigh, NC, USA.
In recent years, discovery proteomics has emerged as a pivotal tool in biological research, especially when studying the intricate relationships among multiple organisms. To delve deeper into these interactions, we pioneered a bottom-up proteomics workflow. Using nanoLC-MS/MS and a label-free quantification method, this work specifically examines the differential protein expression in fleas (Ctenocephalides felis felis) that have been experimentally infected with Bartonella henselae, the causative agent of cat scratch disease (CSD).
View Article and Find Full Text PDFDiagnostics (Basel)
December 2024
Beijing Children's Hospital, Capital Medical University, Beijing 100070, China.
Bartonella henselae is a Gram-negative bacillus, mainly parasitizing on cats. When a child is scratched by a cat, they may present with the disease symptoms including regional lymphadenopathy, malaise, fever, and splenomegaly, which is known as cat-scratch disease (CSD). Ocular manifestations occur in 5-10% of patients with CSD.
View Article and Find Full Text PDFMicrobiol Spectr
January 2025
Laboratory of Bacterial Zoonoses, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan.
a Gram-negative facultative intracellular bacterium, is the etiological agent of cat-scratch disease and also causes bacillary angiomatosis in immunocompromised individuals. Although the ability to promote vascular endothelial cell proliferation differs among species, variations among strains within remain unclear. angiogenic factor A (BafA) and adhesin A (BadA) have been identified as autotransporters of that are involved in endothelial cell proliferation.
View Article and Find Full Text PDFEye (Lond)
February 2025
Department of Ophthalmology, The Permanente Medical Group, Kaiser Permanente- Northern California, Roseville, CA, USA.
Neuroretinitis connotes a descriptive clinical entity of optic disc oedema in association with macular exudates in a star configuration. Accordingly, it does not indicate a specific aetiology, although cat scratch disease caused by Bartonella henselae is the most common cause. Historically, the recognition of neuroretinitis dates to the early 20 century with the eventual understanding that the optic disc is the primary target of disease with secondary macular involvement.
View Article and Find Full Text PDFMedicina (Kaunas)
August 2024
Department of Ophthalmology and Visual Sciences, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8501, Nagasaki, Japan.
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