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Talaromyces marneffei (Segretain, Capponi & Sureau) Samson, N. Yilmaz, Frisvad & Seifert 2011 resmi
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Talaromyces marneffei (Segretain, Capponi & Sureau) Samson, N. Yilmaz, Frisvad & Seifert 2011

Talaromyces marneffei ( İngilizce )

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The surface of a Talaromyces (formerly Penicillium) marneffei colony. Image: James Gathany, CDC

Talaromyces marneffei, formerly called Penicillium marneffei,[1] was identified in 1956.[2] The organism is endemic to southeast Asia where it is an important cause of opportunistic infections in those with HIV/AIDS-related immunodeficiency. Incidence of T. marneffei infections has increased due to a rise in HIV infection rates in the region.[3][4]

When it was classified as a Penicillium, it was the only known thermally dimorphic species of that genus that caused a lethal systemic infection (talaromycosis), with fever and anaemia similar to disseminated cryptococcosis. This contrasted with related Penicillium species that are usually regarded as unimportant in terms of causing human disease.

Epidemiology

There is a high incidence of talaromycosis in AIDS patients in SE Asia; 10% of patients in Hong Kong get talaromycosis as an AIDS-related illness. Cases of T. marneffei human infections (talaromycosis) have also been reported in HIV-positive patients in Australia, Europe, Japan, the UK and the U.S. All the patients, except one,[5] had visited Southeast Asia previously. The disease is considered an AIDS-defining illness.

Discovered in bamboo rats (Rhizomys) in Vietnam,[6] it is associated with these rats and the tropical Southeast Asia area. Talaromyces marneffei is endemic in Myanmar (Burma), Cambodia, Southern China, Indonesia, Laos, Malaysia, Thailand and Vietnam.

Although both the immunocompetent and the immunocompromised can be infected, it is extremely rare to find systemic infections in HIV-negative patients. The incidence of T. marneffei is increasing as HIV spreads throughout Asia. An increase in global travel and migration means it will be of increased importance as an infection in AIDS sufferers.

Talaromyces marneffei has been found in bamboo rat faeces, liver, lungs and spleen. It has been suggested that these animals serve as a reservoir for the fungus. It is not clear whether the rats are affected by T. marneffei or are merely asymptomatic carriers of the disease.

One study of 550 AIDS patients showed that the incidence was higher during the rainy season, which is when the rats breed. But this season also has conditions that are more favorable for production of fungal spores (conidia), which can become airborne and be inhaled by susceptible individuals.

Another study could not establish contact with bamboo rats as a risk factor, but exposure to the soil was the critical risk factor. However, soil samples failed to yield much of the fungus.

It is not known whether people get the disease by eating infected rats, or by inhaling fungi from their faeces.

One HIV-positive physician is known to have been infected while attending a course on tropical microbiology. He did not handle the organism, though students in the same laboratory did. It is presumed he contracted the infection by inhaling aerosol containing T. marneffei conidia. This shows that airborne infections are possible.

Clinical presentation

Patients commonly present with symptoms and signs of infection of the reticuloendothelial system, including generalized lymphadenopathy, hepatomegaly, and splenomegaly. The respiratory system is commonly involved as well; cough, fever, dyspnea, and chest pain may be present, reflecting the probable inhalational route of acquisition. Approximately one-third of patients may also exhibit gastrointestinal symptoms, such as diarrhea.[7][8][9]

Laboratory diagnosis

The fact that Talaromyces marneffei is thermally dimorphic is a relevant clue when trying to identify it. However, it should be kept in mind that other human-pathogenic fungi are thermally dimorphic as well. Cultures should be done from bone marrow, skin, blood and sputum samples.

Plating samples out onto two Sabouraud agar plates, then incubating one at 30 °C and the other at 37 °C, should result in two different morphologies. A mold-form will grow at 30 °C, and a yeast-form at 37 °C.

Mycelial colonies will be visible on the 30 °C plate after two days. Growth is initially fluffy and white and eventually turns green and granular after sporulation has occurred. A soluble red pigment is produced, which diffuses into the agar, causing the reverse side of the plate to appear red or pink. The periphery of the mold may appear orange-coloured, and radial sulcate folds will develop.

Under the microscope, the mold phase will look like a typical Penicillium, with hyaline, septate and branched hyphae; the conidiophores are located both laterally and terminally. Each conidiophore gives rise to three to five phialides, where chains of lemon-shaped conidia are formed.

On the 37 °C plate, the colonies grow as yeasts. These colonies can be cerebriform, convoluted, or smooth. There is a decreased production in pigment, the colonies appearing cream/light-tan/light-pink in colour. Microscopically, sausage-shaped cells are mixed with hyphae-like structures. As the culture ages, segments begin to form. The cells divide by binary fission, rather than budding. The cells are not yeast cells, but rather arthroconidia. Culturing isn't the only method of diagnosis. A skin scraping can be prepared, and stained with Wright's stain. Many intracellular and extracellular yeast cells with crosswalls are suggestive of T. marneffei infection. Smears from bone marrow aspirates may also be taken; this is regarded as the most sensitive method. These samples can be stained with the Giemsa stain. Histological examination can also be done on skin, bone marrow or lymph nodes.

The patient's history also is a diagnostic help. If they have traveled to Southeast Asia and are HIV-positive, then there is an increased risk of them having talaromycosis.

Antigen testing of urine and serum, and PCR amplification of specific nucleotide sequences have been tried, with high sensitivity and specificity. Rapid identification of talaromycosis is sought, as prompt treatment is critical. Treatment should be provided as soon as talaromycosis is suspected.

Treatment

Treatment of talaromycosis depends on the degree of immunosuppression and organ involvement, but most isolates of Talaromyces marneffei display low MIC's to amphotericin B as well as itraconazole, posaconazole and voriconazole.[10]

Research

Genomics

Sexual reproduction

T. marneffei had been assumed to reproduce exclusively by asexual means based on the highly clonal population structure of this species. However, studies by Henk et al.[11] (2012) revealed that the genes required for meiosis are present in T. marneffei. In addition, they obtained evidence for mating and genetic recombination in this species. Henk et al.[11] concluded that T. marneffei is sexually reproducing, but recombination in natural populations is most likely to occur across spatially and genetically limited distances resulting in a highly clonal population structure. It appears that sex can be maintained in this species even though very little genetic variability is produced.

Mycovirology

The study by Lau et al [12] (2018) described the first evidence of a mycovirus in a thermally dimorphic fungus. Talaromyces marneffei partitivirus-1 (TmPV1), a dsRNA mycovirus, was detected in 12.7% (7 out of 55) of clinical T. marneffei isolates. Phylogenetic analysis showed that TmPV1 occupied a distinct clade among the members of the genus Gammapartitivirus. Two virus-free isolates were successfully infected by purified TmPV1 using protoplast transfection. Mice challenged with TmPV1-infected T. marneffei isolates showed significantly shortened survival time and higher fungal burden in organs than mice challenged with isogenic TmPV1-free isolates. Transcriptomic analysis showed that TmPV1 causes aberrant expression of various genes in T. marneffei, with upregulation of potential virulence factors and suppression of RNA interference (RNAi)-related genes.

MicroRNA-like RNAs

Talaromyces marneffei dicer-dependent microRNA-like RNAs (milRNAs) were identified and these milRNAs were found to be differentially expressed in different growth phases of T. marneffei. Furthermore, the phylogeny of RNAi genes of T. marneffei were also described in the same study.[13] Phylogenetic analysis of both ITS and dcl-1 gene showed that the corresponding sequences in T. marneffei were most closely related to Penicillium emmonsii, Penicillium chrysogenum and Aspergillus spp. However, phylogenetic analysis of dcl-2 and qde-2 genes showed a different evolutionary topology. The dcl-2 of T. marneffei and its homologue in T. stipitatus are more closely related to those of the thermal dimorphic pathogenic fungi, Histoplasma capsulatum, Blastomyces dermatitidis, Paracoccidioides brasiliensis and Coccidioides immitis than to P. chrysogenum and Aspergillus spp., suggesting the co-evolution of dcl-2 among the thermal dimorphic fungi. On the other hand, qde-2 of T. marneffei is most closely related to its homologues in other thermal dimorphic fungi than to that in T. stipitatus, P. chrysogenum and Aspergillus spp.

References

  1. ^ Chan JF, Lau SK, Yuen KY, Woo PC (March 2016). "Talaromyces (Penicillium) marneffei infection in non-HIV-infected patients". Emerging Microbes & Infections. 5 (3): e19. doi:10.1038/emi.2016.18. PMC 4820671. PMID 26956447.
  2. ^ Hyde, Kevin D.; Al-Hatmi, Abdullah M. S.; Andersen, Birgitte; Boekhout, Teun; Buzina, Walter; Dawson, Thomas L.; Eastwood, Dan C.; Jones, E. B. Gareth; de Hoog, Sybren (2018-11-10). "The world's ten most feared fungi". Fungal Diversity. 93: 161–194. doi:10.1007/s13225-018-0413-9. ISSN 1560-2745. S2CID 53248512.
  3. ^ Chastain, Daniel B.; Henao-Martínez, Andrés F.; Franco-Paredes, Carlos (2017-08-22). "Opportunistic Invasive Mycoses in AIDS: Cryptococcosis, Histoplasmosis, Coccidiodomycosis, and Talaromycosis". Current Infectious Disease Reports. 19 (10): 36. doi:10.1007/s11908-017-0592-7. ISSN 1523-3847. PMID 28831671. S2CID 26045334.
  4. ^ Ning, Chuanyi; Lai, Jingzhen; Wei, Wudi; Zhou, Bo; Huang, Jiegang; Jiang, Junjun; Liang, Bingyu; Liao, Yanyan; Zang, Ning (2018). "Accuracy of rapid diagnosis of Talaromyces marneffei: A systematic review and meta-analysis". PLOS ONE. 13 (4): e0195569. Bibcode:2018PLoSO..1395569N. doi:10.1371/journal.pone.0195569. ISSN 1932-6203. PMC 5886574. PMID 29621346.
  5. ^ Lo Y, Tintelnot K, Lippert U, Hoppe T (2000). "Disseminated Penicillium marneffei infection in an African AIDS patient". Transactions of the Royal Society of Tropical Medicine and Hygiene. 94 (2): 187. doi:10.1016/S0035-9203(00)90271-2. PMID 10897365.
  6. ^ Capponi M, Segretain G, Sureau P (1956). "Pénicillose de Rhizomys sinensis". Bull Soc Pathol Exot. 49 (3): 418–21.
  7. ^ Louthrenoo W, Thamprasert K, Sirisanthana T (December 1994). "Osteoarticular penicilliosis marneffei. A report of eight cases and review of the literature". British Journal of Rheumatology. 33 (12): 1145–50. doi:10.1093/rheumatology/33.12.1145. PMID 8000744.
  8. ^ Duong TA (July 1996). "Infection due to Penicillium marneffei, an emerging pathogen: review of 155 reported cases". Clinical Infectious Diseases. 23 (1): 125–30. doi:10.1093/clinids/23.1.125. PMID 8816141.
  9. ^ Supparatpinyo K, Khamwan C, Baosoung V, Nelson KE, Sirisanthana T (July 1994). "Disseminated Penicillium marneffei infection in southeast Asia". Lancet. 344 (8915): 110–3. doi:10.1016/s0140-6736(94)91287-4. PMID 7912350. S2CID 38451183.
  10. ^ "Talaromyces marneffei". Mycology Online. The University of Adelaide. Retrieved 5 November 2019.
  11. ^ a b Henk DA, Shahar-Golan R, Devi KR, Boyce KJ, Zhan N, Fedorova ND, Nierman WC, Hsueh PR, Yuen KY, Sieu TP, Kinh NV, Wertheim H, Baker SG, Day JN, Vanittanakom N, Bignell EM, Andrianopoulos A, Fisher MC (2012). "Clonality despite sex: the evolution of host-associated sexual neighborhoods in the pathogenic fungus Penicillium marneffei". PLOS Pathogens. 8 (10): e1002851. doi:10.1371/journal.ppat.1002851. PMC 3464222. PMID 23055919.
  12. ^ Lau SK, Lo GC, Chow FW, Fan RY, Cai JJ, Yuen KY, Woo PC (June 2018). "Novel Partitivirus Enhances Virulence of and Causes Aberrant Gene Expression in Talaromyces marneffei". mBio. 9 (3): e00947–18. doi:10.1128/mBio.00947-18. PMC 6016240. PMID 29895639. CC BY icon.svg Material was copied from this source, which is available under a Creative Commons Attribution 4.0 International License.
  13. ^ Lau, Susanna K. P.; Chow, Wang-Ngai; Wong, Annette Y. P.; Yeung, Julian M. Y.; Bao, Jessie; Zhang, Na; Lok, Si; Woo, Patrick C. Y.; Yuen, Kwok-Yung (2013-08-22). "Identification of MicroRNA-Like RNAs in Mycelial and Yeast Phases of the Thermal Dimorphic Fungus Penicillium marneffei". PLOS Neglected Tropical Diseases. 7 (8): e2398. doi:10.1371/journal.pntd.0002398. ISSN 1935-2735. PMC 3749987. PMID 23991243.
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Talaromyces marneffei: Brief Summary ( İngilizce )

wikipedia EN tarafından sağlandı
The surface of a Talaromyces (formerly Penicillium) marneffei colony. Image: James Gathany, CDC

Talaromyces marneffei, formerly called Penicillium marneffei, was identified in 1956. The organism is endemic to southeast Asia where it is an important cause of opportunistic infections in those with HIV/AIDS-related immunodeficiency. Incidence of T. marneffei infections has increased due to a rise in HIV infection rates in the region.

When it was classified as a Penicillium, it was the only known thermally dimorphic species of that genus that caused a lethal systemic infection (talaromycosis), with fever and anaemia similar to disseminated cryptococcosis. This contrasted with related Penicillium species that are usually regarded as unimportant in terms of causing human disease.

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Talaromyces marneffei ( İspanyolca; Kastilyaca )

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Talaromyces marneffei (anteriormente Penicillium marneffei) es una especie de hongo ascomiceto dimórfico que puede producir peniciliosis en humanos inmunodeprimidos.[1]

Cultivo

Crece en medios medios comunes y, al ser dimórfico, la morfología de las colonias es diferente dependiendo de la temperatura. A 37 ºC en agar sangre o medios sintéticos es levaduriforme, mientras que a temperatura ambiente en agar glucosa-peptona o agar infusión cerebro-corazón forma una colonia blanquecina que con el tiempo pasa a verde y en su reverso es roja o color café.[2]​ Produce un pigmento rojo soluble que difunde en el medio de cultivo.[1]

Referencias

Bibliografía

  • Arenas Guzmán, Roberto (2014). Micología médica ilustrada (5.ª edición). McGraw-Hill Education. ISBN 978-607-15-1125-6.
  • Murray, Patrick L.; Rosenthal, Ken S.; Pfaller, Michael A. (2013). Microbiología médica (7.ª edición). Elsevier. ISBN 978-84-9022-411-3.

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Talaromyces marneffei: Brief Summary ( İspanyolca; Kastilyaca )

wikipedia ES tarafından sağlandı

Talaromyces marneffei (anteriormente Penicillium marneffei) es una especie de hongo ascomiceto dimórfico que puede producir peniciliosis en humanos inmunodeprimidos.​

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Talaromyces marneffei ( Fransızca )

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Talaromyces marneffei, anciennement appelé Penicillium marneffei[2], est une espèce découverte en 1956, considéré au début du XXIe siècle comme l'un des dix mycètes les plus redoutés au monde[3] en raison de la maladie mortelle qu'il déclenche, la pénicillose. C'est un fonge particulièrement dangereux en raison de l'affaiblissement de l'immunité qu'entraîne la contamination (il s'agit d'un champignon opportuniste). Présent principalement en Asie du Sud-Est, iI affecte tout particulièrement les personnes dont le système immunitaire a été affaibli par l'infection à VIH[4],[5].

Classé dans un premier temps dans le genre Penicillium, il s'agissait de la seule espèce thermiquement dimorphique connue de ce genre qui provoquait une infection systémique mortelle), avec des symptômes comme la fièvre et une anémie, similaires à la cryptococcose. Cela contraste avec les autres membres du genre Penicillium qui ne sont pas considérées comme pathogènes et participera à sa reclassification dans le genre Talaromyces.

Références

  • (en) Cet article est partiellement ou en totalité issu de l’article de Wikipédia en anglais intitulé .
  1. V. Robert, G. Stegehuis and J. Stalpers. 2005. The MycoBank engine and related databases. https://www.mycobank.org/, consulté le 23 avril 2021
  2. « Talaromyces (Penicillium) marneffei infection in non-HIV-infected patients », Emerging Microbes & Infections, vol. 5, no 3,‎ mars 2016, e19 (PMID , PMCID , DOI )
  3. Hyde, Al-Hatmi, Andersen et Boekhout, « The world's ten most feared fungi », Fungal Diversity, vol. 93,‎ 10 novembre 2018, p. 161–194 (ISSN , DOI )
  4. Chastain, Henao-Martínez et Franco-Paredes, « Opportunistic Invasive Mycoses in AIDS: Cryptococcosis, Histoplasmosis, Coccidiodomycosis, and Talaromycosis », Current Infectious Disease Reports, vol. 19, no 10,‎ 22 août 2017, p. 36 (ISSN , PMID , DOI )
  5. Ning, Lai, Wei et Zhou, « Accuracy of rapid diagnosis of Talaromyces marneffei: A systematic review and meta-analysis », PLOS ONE, vol. 13, no 4,‎ 2018, e0195569 (ISSN , PMID , PMCID , DOI , Bibcode )

Références biologiques

Bibliographie

  • « Penicillium marneffei infection and recent advances in the epidemiology and molecular biology aspects », Clinical Microbiology Reviews, vol. 19, no 1,‎ janvier 2006, p. 95–110 (PMID , PMCID , DOI )
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Talaromyces marneffei: Brief Summary ( Fransızca )

wikipedia FR tarafından sağlandı

Talaromyces marneffei, anciennement appelé Penicillium marneffei, est une espèce découverte en 1956, considéré au début du XXIe siècle comme l'un des dix mycètes les plus redoutés au monde en raison de la maladie mortelle qu'il déclenche, la pénicillose. C'est un fonge particulièrement dangereux en raison de l'affaiblissement de l'immunité qu'entraîne la contamination (il s'agit d'un champignon opportuniste). Présent principalement en Asie du Sud-Est, iI affecte tout particulièrement les personnes dont le système immunitaire a été affaibli par l'infection à VIH,.

Classé dans un premier temps dans le genre Penicillium, il s'agissait de la seule espèce thermiquement dimorphique connue de ce genre qui provoquait une infection systémique mortelle), avec des symptômes comme la fièvre et une anémie, similaires à la cryptococcose. Cela contraste avec les autres membres du genre Penicillium qui ne sont pas considérées comme pathogènes et participera à sa reclassification dans le genre Talaromyces.

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Penicillium marneffei ( Endonezce )

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 src=
Permukaan koloni Penicillium marneffei. Gambar: James Gathany, CDC

Spesies Penicillium biasanya dianggap tidak penting pada istilah penyebab penyakit manusia. Penicillium marneffei yang ditemukan pada tahun 1956 berbeda. Spesies ini adalah spesies penicillium satu-satunya yang diketahui thermally dimorphic dan dapat menyebabkan infeksi sistemik (penisiliosis) dengan demam dan anemia mirip dengan cryptococcosis).

Perawatan

Dua minggu amphotericin B, lalu sepuluh minggu itraconazole oral.

Pranala luar

Abstract on P. marneffei epidemiology and diagnosis [1]

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Penicillium marneffei: Brief Summary ( Endonezce )

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 src= Permukaan koloni Penicillium marneffei. Gambar: James Gathany, CDC

Spesies Penicillium biasanya dianggap tidak penting pada istilah penyebab penyakit manusia. Penicillium marneffei yang ditemukan pada tahun 1956 berbeda. Spesies ini adalah spesies penicillium satu-satunya yang diketahui thermally dimorphic dan dapat menyebabkan infeksi sistemik (penisiliosis) dengan demam dan anemia mirip dengan cryptococcosis).

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Penicillium marneffei ( İtalyanca )

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P. marneffei è l'agente eziologico della penicilliosi, malattia disseminata a carico del sistema reticolo endoteliale che colpisce soprattutto le persone con HIV.

Struttura

P. marneffei è un fungo patogeno opportunista dimorfico[1].

Epidemiologia

Il fungo è endemico nel sud-est asiatico, dove cresce nel suolo umido e infesta il ratto del bambù. Il fungo non è in grado di colonizzare i soggetti sani con una buona immunità cellulo mediata; la patologia si evidenzia solo nei soggetti immuno depressi.

Profilo clinico

La fase prodromica può essere asintomatica o accompagnata da sintomi simil influenzali aspecifici. Tosse, febbre, infiltrato polmonare, linfoadenopatia, anemia, leucoplachia e trombocitopenia si manifestano con il progredire della malattia.

Le fasi finali sono caratterizzate da lesioni cutanee su viso e tronco, simili al mollusco contagioso. Queste manifestazioni sono indice di disseminazione ematica.

Il quadro clinico procede con cachessia, anoressia e astenia progressiva; queste manifestazioni si concludono con la morte del soggetto immunodepresso.

Profilo diagnostico

Nell'espettorato e nel lavaggio bronco-alveolare possono essere evidenziati i caratteristici lieviti settati. La crescita in Sabouraud dextrose agar di forme ifali producenti pigmento rosso diffuso è patognomonico dell'infezione da P. marneffei.

Terapia, prevenzione e controllo

Sono consigliati amfotericina B e flucitosina per 2 settimane dalla diagnosi di infezione. La terapia deve continuare per 10 settimane sostenuta da itraconazolo.

Note

  1. ^ "Principi di Microbiologia Medica" - M. La Placa - XIV edizione - Edises

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Penicillium marneffei: Brief Summary ( İtalyanca )

wikipedia IT tarafından sağlandı

P. marneffei è l'agente eziologico della penicilliosi, malattia disseminata a carico del sistema reticolo endoteliale che colpisce soprattutto le persone con HIV.

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Penicillium marneffei ( Portekizce )

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Penicillium marneffei é uma espécie do gênero Penicillium que possui dimorfismo térmico ao crescer tanto a temperaturas de 37ºC quanto inferiores a 30ºC. Pode provocar infecções.[1]

Referências

  1. «Penicilliosis marneffei». Consultado em 8 de novembro de 2013. Arquivado do original em 5 de março de 2016
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Penicillium marneffei: Brief Summary ( Portekizce )

wikipedia PT tarafından sağlandı

Penicillium marneffei é uma espécie do gênero Penicillium que possui dimorfismo térmico ao crescer tanto a temperaturas de 37ºC quanto inferiores a 30ºC. Pode provocar infecções.

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Penicillium marneffei ( Szl )

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Penicillium marneffei je grzib[1], co go ôpisoł Segretain 1960. Penicillium marneffei nŏleży do zorty Penicillium i familije Trichocomaceae.[2][3] Żŏdne podgatōnki niy sōm wymianowane we Catalogue of Life.[2]

Przipisy

  1. Segretain (1960), In: Bull. trimest. Soc. mycol. Fr. 75(4):416
  2. 2,0 2,1 Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (red.): Species 2000 & ITIS Catalogue of Life: 2019 Annual Checklist.. Species 2000: Naturalis, Leiden, the Netherlands., 2019. [dostymp 24 września 2012].
  3. Species Fungorum. Kirk P.M., 2010-11-23

Muster:Taxonbar

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Penicillium marneffei: Brief Summary ( Szl )

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Penicillium marneffei je grzib, co go ôpisoł Segretain 1960. Penicillium marneffei nŏleży do zorty Penicillium i familije Trichocomaceae. Żŏdne podgatōnki niy sōm wymianowane we Catalogue of Life.

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