A new Papulaspora species from the infected eye of a horse: Papulaspora equi sp. nov.

Hj, Shadomy; Dm, Dixon

doi:10.1007/bf00436924

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…P. equi was the causative organism in an unspecified ocular infection of a horse from Alabama [39]. In addition, P. immersa has been isolated from horse manure, demonstrating its presence in the equine environment [39]. Both horses with Papulaspora in the present study had superficial plaques that were brown-black in appearance (Fig 1).…”

Section: Discussionsupporting

confidence: 51%

“…Interestingly, 2 cases of keratomycosis in our study were due to Papulaspora species, a bulbiferous hyphomycete [39]. One species was identified as P. sepedonioides using DNA sequencing; the second Papulaspora isolate was not speciated.…”

Section: Discussionmentioning

confidence: 66%

“…To the authors' knowledge, P. sepedonioides has never been recovered from a horse with keratomycosis. P. equi was the causative organism in an unspecified ocular infection of a horse from Alabama [39]. In addition, P. immersa has been isolated from horse manure, demonstrating its presence in the equine environment [39].…”

Section: Discussionmentioning

confidence: 99%

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Equine keratomycoses in California from 1987 to 2010 (47 cases)

Reed

Thomasy²,

Good³

et al. 2012

Equine Veterinary Journal

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Summary Reasons for Performing Study Equine keratomycosis in the western United States has received little study, likely due to its low prevalence. Objectives To determine clinical features, predominant fungal isolates, treatment modalities, and outcomes of horses with keratomycosis in California and compare these with results from different geographic regions. Methods Records of horses presented to the University of California-Davis Veterinary Medical Teaching Hospital (UCD-VMTH) with confirmed keratomycosis between 1987 and 2010 were reviewed for this retrospective study. Information retrieved from the record included signalment, ophthalmic examination findings, treatment prior to and following presentation, visual outcome, and ocular survival. Results A total of 48 eyes of 47 horses met inclusion criteria and comprised 2% of cases presented to the UCD-VMTH ophthalmology service. Prior to presentation, 20 horses (43%) received at least one topically administered anti-inflammatory medication. Keratomycosis was confirmed by fungal culture in 38 horses (81%), by histopathology in 2 horses (4%) or by cytology in 7 horses (15%). Forty-four isolates were identified in the 38 horses cultured; Aspergillus was the most common isolate (64%) and a novel isolate, Papulospora, was identified in 2 horses. Treatment consisted of medications only (73%), medical and surgical treatment (25%), or immediate enucleation (2%). Globe retention was 77% and vision retention was 53%. Corneal perforation was significantly associated with loss of vision (P < 0.001). Conclusions Keratomycosis is relatively uncommon in horses presented for ophthalmic conditions at UCD-VMTH. Corneal perforation was a negative prognostic indicator for vision in this population of northern Californian horses.

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Section: Discussionsupporting

confidence: 51%

Section: Discussionmentioning

confidence: 66%

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Equine keratomycoses in California from 1987 to 2010 (47 cases)

Reed

Thomasy²,

Good³

et al. 2012

Equine Veterinary Journal

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“…dosporium, Scopulariopsis, Scytalidium, Stemphylium, and Trichoderma spp) and yeasts (eg, Candida, Cryptococcus, Histoplasma, Rhodotorula, Saccharomyces, and Trichosporon spp) have also been described. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Most of these fungi are normal inhabitants of the equine extraocular microflora and environment. [21][22][23] Fungi are capable of invading the cornea only after circumvention of normal ocular anatomic and immunologic protective barriers.…”

mentioning

confidence: 99%

In vitro susceptibility patterns of fungi associated with keratomycosis in horses of the northeastern United States: 68 cases (1987–2006)

Ledbetter¹,

Patten²,

Scarlett³

et al. 2007

javma

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“…Isolation of species of Papulaspora from a wide variety of substrates including plant debris, pulp products, wood, dung, soil, other fungi and animal tissues has led to the speculation that these fungi act as saprobes, mycoparasites and opportunistic pathogens (Hotson 1912, Warren 1948, Crane 1975, Shadomy and Dixon 1989. However little is known about the life history of members of this genus and its ecological functions are not well understood.…”

Section: Introductionmentioning

confidence: 97%

Evidence that the gemmae of Papulaspora sepedonioides are neotenous perithecia in the Melanosporales

Davey¹,

Tsuneda²,

Currah

2008

Mycologia

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Papulaspora sepedonioides produces large multicellular gemmae with several, thick-walled central cells enclosed within a sheath of smaller thin-walled cells. Phylogenetic analysis of the large subunit rDNA indicates P. sepedonioides has affinities to the Melanosporales (Hypocreomycetidae). The development of gemmae in P. sepedonioides was characterized by light and scanning and transmission electron microscopy and was similar to previous ontogenetic studies of ascoma development in the Melanosporales. However instead of giving rise to ascogenous tissues the central cells of the incipient gemma became darkly pigmented, thick walled and filled with lipid globules while the contents of the sheath cells autolysed, leaving them empty and deflated at maturity. Both central cells and pre-autolytic sheath cells produced both germ tubes and new gemmae primordia, suggesting microcyclic conidiogenesis occurs in this species. Mature gemmae were non-deciduous or seceded by schizolytic secession and appear to have both perennating and disseminative potential. The evolution of these neotenous perithecial propagules may be driven by life-history and ecological factors selecting for functional versatility.

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A new Papulaspora species from the infected eye of a horse: Papulaspora equi sp. nov.

Cited by 8 publications

References 4 publications

Equine keratomycoses in California from 1987 to 2010 (47 cases)

Equine keratomycoses in California from 1987 to 2010 (47 cases)

In vitro susceptibility patterns of fungi associated with keratomycosis in horses of the northeastern United States: 68 cases (1987–2006)

Evidence that the gemmae of Papulaspora sepedonioides are neotenous perithecia in the Melanosporales

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