{"id":11696,"date":"2023-03-10T16:17:46","date_gmt":"2023-03-10T16:17:46","guid":{"rendered":"https:\/\/todaysveterinarynurse.com\/?p=11696"},"modified":"2023-03-13T17:48:42","modified_gmt":"2023-03-13T17:48:42","slug":"mycobacterial-infection-in-a-cat","status":"publish","type":"post","link":"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/dermatology\/mycobacterial-infection-in-a-cat\/","title":{"rendered":"Mycobacterial Infection in a Cat"},"content":{"rendered":"<div class=\"su-spacer\" style=\"height:20px\"><\/div><div class=\"su-note\"  style=\"border-color:#d8d8d8;border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#f2f2f2;border-color:#ffffff;color:#333333;border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;\"><b>Abstract<\/b><\/p>\n<p class=\"p1\">Mycobacterial infection is an uncommon result of penetrating wounds in cats, but one that should be considered in the differential diagnoses when a cat presents with draining tracts in fatty areas.<\/p>\n<p class=\"p1\">Culture performed by a mycobacterial laboratory is recommended to identify the organism. Prolonged systemic treatment with oral antibiotics is generally required and prognosis is guarded.<b><\/b><\/p>\n<p><b>Take-Home Points <\/b><\/p>\n<ul>\n<li class=\"p1\">Rapidly growing mycobacteria are normally found in soil and various water sources.<\/li>\n<li class=\"p1\">Mycobacterial infection may be observed in cats after cat fights with penetrating wounds.<\/li>\n<li class=\"p1\">Lesions on cats appear as draining tracts or plaques that develop purulent discharge.<\/li>\n<li class=\"p1\">The lesions are commonly seen on the abdominal or inguinal regions.<\/li>\n<li class=\"p1\">Mycobacteria can be difficult to identify. Culture performed by a mycobacterial laboratory is recommended.<\/li>\n<li class=\"p1\">Systemic treatment with oral antibiotics is generally administered for 1 to 2 months after clinical remission, as clinical remission can take more than a year.<\/li>\n<li class=\"p1\">Prognosis for mycobacterial infection is guarded.<\/div><\/div><\/li>\n<\/ul>\n<p class=\"p1\"><span class=\"s1\">M<\/span><span class=\"s1\">ycobacterial infection should be a diagnostic differential for an indoor\u2013outdoor or exclusively outdoor cat that has draining tracts in fatty areas. It is most commonly caused by a penetrating wound, and even if the owner did not witness a cat fight, this should be a consideration. Mycobacterial lesions appear as nodules, draining tracts, and plaques with purulent discharge. This appearance tends to vary from a common cat bite abscess, which usually heals in 5 to 7 days. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Once mycobacterial infection has been diagnosed, participation in the care of a patient by the veterinary nurse is instrumental, starting with obtaining a thorough history, followed by performing diagnostic tests and treatment, and finally communicating with the client during recheck appointments and follow-up care.<\/span><\/p>\n<h2 class=\"p3\">History<\/h2>\n<p class=\"p2\"><span class=\"s1\">Buddy, a 7-year-old, neutered male, domestic shorthair cat presented on April 17, 2020, for a year-long history of nonhealing wounds with draining tracts on his ventral abdomen and caudal dorsum. Buddy was an outdoor cat, and the owners had heard him being attacked by another animal in January 2019. He was presented to his general practice veterinarian on July 19, 2019, for nonhealing wounds from that attack and was administered a 51-mg subcutaneous injection of <a href=\"https:\/\/todaysveterinarypractice.com\/pharmacology\/cefovecin-sodium-for-skin-and-soft-tissue-infections\/\" target=\"_blank\" rel=\"noopener\">cefovecin<\/a>. He received 2 additional cefovecin 51-mg subcutaneous injections 2 weeks apart without response. At the third recheck, he was also pyrexic (40.2 \u00b0C [104.4 \u00b0F]). A 20-day course of enrofloxacin 34 mg PO q12h was prescribed. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">On September 19, 2019, Buddy presented for a fourth recheck with no response to therapy. Cephalexin 125\u00a0mg\/5 mL was prescribed at 50 mg PO q12h for 2\u00a0weeks and was refilled by the general practitioner in December 2019. On January 25, 2020, Buddy presented again due to the wounds still not resolving. He was administered cefovecin 51 mg SC and methylprednisolone acetate 10 mg IM. These injections were repeated 3 more times over the course of 2\u00a0months. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">On April 2, 2020, Buddy presented to the general practitioner for lethargy and anorexia, as well as the nonhealing wounds. His weight had dropped from 6.4\u00a0kg (14.1 lb) to 4.4 kg (9.7 lb). Buddy was started back on 50 mg of cephalexin 125 mg\/5mL PO q12h and referred to a veterinary dermatologist.<\/span><\/p>\n<h2 class=\"p3\">Presentation<\/h2>\n<p class=\"p2\"><span class=\"s1\">On physical examination, Buddy weighed 3.7 kg (8.2\u00a0lb). His temperature was normothermic at 38.4 \u00b0C (101.1 \u00b0F), his heart rate was 200 beats\/min (bpm), and his respiratory rate was 40\u00a0breaths\/min. His mucous membranes were moist and pink, with a capillary refill time of less than 2\u00a0seconds. Two hours prior to the examination, the owners had administered gabapentin 100 mg PO to reduce fractiousness, and he was moderately sedated. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">The dermatologic examination showed serous crusting along Buddy\u2019s caudal dorsum with numerous focal draining tracts exuding purulent discharge. The ventral abdomen had a similar appearance, along with alopecia <strong>(<\/strong><\/span><strong><span class=\"s2\">FIGURE 1<\/span><\/strong><span class=\"s1\"><strong>)<\/strong>. Buddy was painful on palpation of the affected areas, even while sedated.<\/span><\/p>\n<div id=\"attachment_11699\" style=\"width: 511px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig1.png\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-11699\" class=\" wp-image-11699\" src=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig1.png\" alt=\"\" width=\"501\" height=\"237\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig1.png 864w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig1-300x142.png 300w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig1-768x364.png 768w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/a><p id=\"caption-attachment-11699\" class=\"wp-caption-text\">Figure 1. Ventral abdomen with draining tracts and purulent discharge.<\/p><\/div>\n<h2 class=\"p3\">Diagnosis<\/h2>\n<p class=\"p2\"><span class=\"s1\">Based on the initial problem list of draining tracts, lethargy, anorexia, serous crusting, and <a href=\"https:\/\/todaysveterinarypractice.com\/dermatology\/alopecia-diagnosis-cats\/\" target=\"_blank\" rel=\"noopener\">alopecia<\/a>, the clinical diagnostic differentials were deep bacterial infection, superficial <a href=\"https:\/\/todaysveterinarypractice.com\/dermatology\/treating-canine-superficial-pyoderma-in-the-era-of-antimicrobial-resistance\/\" target=\"_blank\" rel=\"noopener\">secondary pyoderma<\/a>, and deep <a href=\"https:\/\/todaysveterinarypractice.com\/internal-medicine\/approaches-to-opportunistic-fungal-infections-in-small-animals\/\" target=\"_blank\" rel=\"noopener\">fungal infection<\/a>.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Buprenorphine 0.3 mg\/mL was administered at 0.8 mg PO to provide additional sedation for <a href=\"https:\/\/todaysveterinarynurse.com\/clinical-pathology\/how-to-collect-and-prepare-samples-for-the-laboratory\/\" target=\"_blank\" rel=\"noopener\">sample collection<\/a>. An impression cytology sample obtained from the ventral abdomen revealed macrophages, nondegenerative neutrophils, degenerative neutrophils, and a few coccoid bacteria. Two affected areas on the ventral abdomen were selected as biopsy sites <strong>(<\/strong><\/span><strong><span class=\"s2\">FIGURE 2<\/span><\/strong><span class=\"s1\"><strong>)<\/strong>. <\/span><\/p>\n<div class=\"mceTemp\"><\/div>\n<div class=\"mceTemp\"><\/div>\n<div id=\"attachment_11700\" style=\"width: 361px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig2.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-11700\" class=\" wp-image-11700\" src=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig2.png\" alt=\"\" width=\"351\" height=\"601\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig2.png 648w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig2-175x300.png 175w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig2-598x1024.png 598w\" sizes=\"(max-width: 351px) 100vw, 351px\" \/><\/a><p id=\"caption-attachment-11700\" class=\"wp-caption-text\">Figure 2. Ventral abdomen biopsy sites.<\/p><\/div>\n<p class=\"p2\"><span class=\"s1\">The sites were injected with 1.5 mL of a 2% lidocaine and epinephrine 1:1000 solution. A 4-mm dermal punch was used to collect biopsy samples, and the sites were sutured closed with 3-0 nonabsorbable monofilament suture using a cruciate suture pattern. One of the biopsy samples was submitted to a dermatohistopathologist and the other sample was submitted to a mycobacterial laboratory for deep skin culture. A complete blood count (CBC) and serum biochemical profile were also performed. Based on the differential diagnoses, treatment with marbofloxacin 12.5 mg PO q24h was initiated pending culture results.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Results of the deep skin culture revealed infection with <i>Mycobacterium porcinum,<\/i> a species of rapidly growing mycobacteria (RGM). The histopathology results revealed severe chronic pleocellular dermatitis and panniculitis with fibroplasia and mild necrosis <strong>(<\/strong><\/span><strong><span class=\"s2\">FIGURE 3<\/span><\/strong><span class=\"s1\"><strong>)<\/strong>. Fungal stain was negative and neoplasia was ruled out. The CBC and serum biochemistry results revealed a moderate anemia, moderate leukocytosis, and mild hyperglycemia. These findings were likely due to stress and chronic disease.<\/span><\/p>\n<div id=\"attachment_11701\" style=\"width: 361px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3A.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-11701\" class=\" wp-image-11701\" src=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3A.png\" alt=\"\" width=\"351\" height=\"270\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3A.png 864w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3A-300x231.png 300w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3A-768x591.png 768w\" sizes=\"(max-width: 351px) 100vw, 351px\" \/><\/a><p id=\"caption-attachment-11701\" class=\"wp-caption-text\">Figure 3A. Low-magnification histopathology slides of the patient\u2019s inflamed skin showing severe chronic pleocellular dermatitis and panniculitis with fibroplasia and mild necrosis.<\/p><\/div>\n<div id=\"attachment_11702\" style=\"width: 360px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3B.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11702\" class=\" wp-image-11702\" src=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3B.png\" alt=\"\" width=\"350\" height=\"213\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3B.png 1008w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3B-300x182.png 300w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Fig3B-768x467.png 768w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/a><p id=\"caption-attachment-11702\" class=\"wp-caption-text\">Figure 3B. High-magnification histopathology slides of the patient\u2019s inflamed skin showing severe chronic pleocellular dermatitis and panniculitis with fibroplasia and mild necrosis.<\/p><\/div>\n<h2 class=\"p3\">Treatment<\/h2>\n<p class=\"p2\"><span class=\"s1\">Based on the results of culture and sensitivity testing <strong>(<\/strong><\/span><strong><span class=\"s2\">TABLE 1<\/span><\/strong><span class=\"s1\"><strong>)<\/strong>, marbofloxacin 12.5 mg PO q24h was to be continued for at least 3 months.<\/span><\/p>\n<p><a href=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-11704\" src=\"https:\/\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1.png\" alt=\"\" width=\"2033\" height=\"1168\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1.png 2033w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1-300x172.png 300w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1-1024x588.png 1024w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1-768x441.png 768w, https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/wp-content\/uploads\/sites\/3\/2023\/03\/Brown_TVNSpring23_MycobacterialInfection_Table1-1536x882.png 1536w\" sizes=\"(max-width: 2033px) 100vw, 2033px\" \/><\/a><\/p>\n<h2 class=\"p3\">Follow-Up<\/h2>\n<p class=\"p2\"><span class=\"s1\">In a follow-up phone call on April 28, 2020, the owner said that Buddy\u2019s appetite had improved and he was more active. At a recheck on May 28, Buddy was markedly improved. The owner reported that he was much more energetic and his appetite was back to normal. The crusting was resolving and there were no more draining tracts. He was no longer painful on palpation.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">It was recommended to continue the marbofloxacin 12.5 mg PO q24h and to start doxycycline 25 mg PO q12h. Administration of water after the doxycycline to prevent esophageal ulcerations was discussed.<sup>1 <\/sup>A recheck was recommended in 6 to 8 weeks.<\/span><\/p>\n<h2 class=\"p3\">Discussion<\/h2>\n<p class=\"p2\"><span class=\"s1\">RGM are opportunistic, atypical, nontuberculous organisms that can start to form colonies after just 7\u00a0days.<sup>1,2<\/sup> They are considered saprophytes, which are normally found in soil and various water sources.<sup>1,3<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Mycobacteriosis is rare in dogs and uncommon in cats.<sup>3<\/sup> It is generally contracted from contaminated soil or dirt injected into the skin.<sup>2<\/sup> It is commonly observed in cats with penetrating wounds obtained during outdoor cat fights.<sup>2<\/sup> The lesions appear as nonhealing nodules and plaques and develop purulent discharge.<sup>2,3<\/sup> In cats, the lesions are commonly seen on the abdominal or inguinal regions, but they can occur anywhere on the body.<sup>2,3<\/sup> On physical examination, affected cats may also be pyrexic, lethargic, and anorexic.<sup>3<\/sup> <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Diagnosis can be confirmed by identifying acid-fast bacilli (AFB) on smears, histology, or culture.<sup>2,4<\/sup> AFB are usually hard to find on cytology and histology.<sup>3,4<\/sup> Dermatohistopathology generally reveals nodular to diffuse pyogranulomatous dermatitis and panniculitis, as in this case.<sup>2,3<\/sup> Cultures should be performed on a 5% sheep blood agar plate and a mycobacterial medium.<sup>1,2<\/sup> Species identification can be difficult and is recommended to be performed by a mycobacterial laboratory.<sup>2,4<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Systemic treatment is administered based on the susceptibility results.<sup>3<\/sup> Oral antibiotics should be administered long-term, generally 3 to 6 months.<sup>3<\/sup> Once clinical signs have resolved, the antibiotics should be continued for an additional 1 to 2 months.<sup>2,3<\/sup> Antimicrobials that have shown to be effective include doxycycline, marbofloxacin, enrofloxacin, ciprofloxacin, clofazimine, clarithromycin, and pradofloxacin.<sup>1,2,3,4<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Prognosis of RGM infection is guarded.<sup>3,4<\/sup> It is not considered contagious to humans or other animals.<sup>3<\/sup> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Infection from Mycobacterium porcinum is an uncommon result of penetrating wounds, but one that should be considered when a cat presents with draining tracts in fatty areas.<\/p>\n","protected":false},"author":236,"featured_media":11703,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":0,"footnotes":""},"categories":[237],"tags":[145],"class_list":["post-11696","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring-2023","tag-peer-reviewed","column-case-reports","clinical_topics-dermatology"],"acf":{"hide_sidebar":false,"hide_sidebar_ad":false,"hide_all_ads":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mycobacterial Infection in a Cat | Today&#039;s Veterinary Nurse<\/title>\n<meta name=\"description\" content=\"Mycobacterial infection is an uncommon result of penetrating wounds in cats, but one that should be considered when a cat presents with draining tracts.\" \/>\n<meta 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