Microsporidia is a very small organism and unless the pathologist has the organism in the differential diagnosis it may pass undiagnosed. [cureus.com]

[…] culture-negative samples and difficulty in differentiating Microsporidia from necrotic debris in routine stains explain the challenges and the need for an increased awareness in timely diagnoses of this infection by the ophthalmologist, microbiologist, and ocular pathologist [ijo.in]

The physician Hans Reiter as a prisoner of war in Nuremberg: a contextual review of his interrogation (1945–1947). Semin Arthritis Rheum. 2003;32:208–230. doi:10.1053/sarh.2003.49995 [CrossRef] Hannu T. Reactive arthritis. [healio.com]

Culture of the joint aspirate grew no organism and pediatric rheumatology made a diagnosis of reactive arthritis. [healio.com]

Diagnosis of microsporidiosis currently depends on morphological demonstration of the organisms in one or more readily obtainable specimens such as stool, duodenal aspirates, urine, sputum, nasal discharge, bronchoalveolar lavage fluid, conjunctival smears [bmcophthalmol.biomedcentral.com]

Non-validated classification criteria exist. 6 Clinically, a monoarthritis or oligoarthritis follows enteric or genitourinary infection by 2 to 4 weeks (range: 1 day to 6 weeks). 6,7 It is not necessary to have the full triad of arthritis, non-gonococcal [healio.com]

A positive Borrelia burgdorferi antibody enzyme immunoassay and Western blot analysis (9 of 10 reactive immunoglobulin G bands and 1 of 3 immunoglobulin M bands) confirmed the diagnosis. [ncbi.nlm.nih.gov]

We describe a 15-year-old HLA-B27–positive boy with infectious gastroenteritis complicated by polyarthritis and a severe painful keratitis. [healio.com]