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ACTINOMYCES AND NOCARDIA Doç.Dr.Hrisi BAHAR. ACTINOMYCETES.

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Presentation on theme: "ACTINOMYCES AND NOCARDIA Doç.Dr.Hrisi BAHAR. ACTINOMYCETES."— Presentation transcript:

1 ACTINOMYCES AND NOCARDIA Doç.Dr.Hrisi BAHAR

2 ACTINOMYCETES

3 AEROBIC ACTINOMYCETES ► Gram-positive branching filaments that sporulate or fragment: According to the composition of the cell wall they are studied in 2 groups. Aerobic Actinomycetes whose cell walls contain mycolic acid: ►1- Aerobic Actinomycetes whose cell walls contain mycolic acid: Nocardia species and Rhodococcus species 2-Aerobic Actinomycetes whose cell walls ► 2-Aerobic Actinomycetes whose cell walls lack mycolic acid: Streptomyces species

4 ANAEROBIC ACTINOMYCETES Anaerobic non-sporulating Gram- positive rods consist of two groups based on guanosine (G) plus cytosine (C) DNA content: ► Anaerobic non-sporulating Gram- positive rods consist of two groups based on guanosine (G) plus cytosine (C) DNA content: -Low mole percent (30-53%) 1-Low mole percent (30-53%) -High mole percent (49-68%) 2-High mole percent (49-68%) Actinomyces species are member of the high G+C group. ► Actinomyces species are member of the high G+C group.

5 Pathogenic Genera of Aerobic Actinomycetes Nocardia ► Nocardia Actinomadura ► Actinomadura Streptomyces ► Streptomyces Rhodococcus ► Rhodococcus Gordonia ► Gordonia Tsukamurella ► Tsukamurella Tropheryma whipplei (Non-cultivable) ► Tropheryma whipplei (Non-cultivable)

6 Aerobic Actinomycetes: Natural Habitats Nocardia species and other aerobic Nocardia species and other aerobic Actinomycetes are in soil and primarily responsible for decomposition of organic plant matter Rhodococcus species present in the intestinal bacterial flora of grazing herbivores especially horses Rhodococcus species present in the intestinal bacterial flora of grazing herbivores especially horses Streptomyces species (>3,000) widely distributed in soil Streptomyces species (>3,000) widely distributed in soil

7 Anaerobic Actinomycetes: Natural Habitats Anaerobic Actinomyces species are normal inhabitants of the mucous membranes of humans and animals

8 Aerobic Actinomycetes: Modes of Infection Actinomadura species (A. madurae, A. latina, A. pelletieri) produce subcutaneous infections in tropical and subtropical countries with those who walk barefooted ► Actinomadura species (A. madurae, A. latina, A. pelletieri) produce subcutaneous infections in tropical and subtropical countries with those who walk barefooted Gordonia and Tsukamurella species are closely related to Rhodococcus, and are soil organisms considered opportunistic pathogens ► Gordonia and Tsukamurella species are closely related to Rhodococcus, and are soil organisms considered opportunistic pathogens

9 Anaerobic Actinomyces: Modes of Infection Actinomyces invades normally ► Actinomyces invades normally sterile tissue from endogenous mucous membrane sites of normal colonization

10 Aerobic Actinomycetes: Types of Infectious Disease -1- ► Rhodococcus equi infects macrophages inhibiting phagolysosome fusion, and produces pulmonary disease with cavitation. Infection occurs in immunocompromised (especially HIV-infected) individuals who handle horses. ► R. equi disseminates to other organs including the brain and subcutaneous tissue

11 Aerobic Actinomycetes: Types of Infectious Disease -2- Streptomyces (S. anulatus formerly S. griseus, ► Streptomyces (S. anulatus formerly S. griseus, and S. somaliensis) is associated with actinomycotic mycetoma in warm climates. Streptomyces somaliensis is a frequent cause of actinomycotic mycetomas of the head and neck. ► Streptomyces somaliensis is a frequent cause of actinomycotic mycetomas of the head and neck.

12 Aerobic Actinomycetes: Types of Infectious Disease Whipple’s disease: The cause is infection with the bacterium Tropheryma whipplei. This bacterium can initially affect the mucosal lining of the small intestine, forming small lesions within the intestinal wall. With time, the infection can spread to other parts of the body. Diarrhea, weight loss, lymphadenopathy, fever, and arthralgia are between the symptoms ► Whipple’s disease: The cause is infection with the bacterium Tropheryma whipplei. This bacterium can initially affect the mucosal lining of the small intestine, forming small lesions within the intestinal wall. With time, the infection can spread to other parts of the body. Diarrhea, weight loss, lymphadenopathy, fever, and arthralgia are between the symptoms Diagnosis is by typical histopathology combined with PCR) ► Diagnosis is by typical histopathology combined with PCR)

13 Actinomycosis Actinomyces israelii causes actinomycosis in which chronic granulomas become suppurative. ► Actinomyces israelii causes actinomycosis in which chronic granulomas become suppurative. Cervicofacial actinomycosis most common (~60%), followed by abdominal (20%) and pulmonary actinomycosis(15%). ► Cervicofacial actinomycosis most common (~60%), followed by abdominal (20%) and pulmonary actinomycosis(15%). Tissue pus contains “sulfur granules”, a mass of branching bacteria. ► Tissue pus contains “sulfur granules”, a mass of branching bacteria. Presence of sulfur granules establishes a diagnosis of actinomycosis. ► Presence of sulfur granules establishes a diagnosis of actinomycosis.

14 Anaerobic Actinomyces: Types of Infectious Disease -2-

15 Aerobic Actinomycetes: Identification Rhodococcus, Gordonia, and Tsukamurella difficult to characterize biochemically. Identification is based on partial acid-fastness, colony morphology, and 16S rRNA gene sequence analysis ► Rhodococcus, Gordonia, and Tsukamurella difficult to characterize biochemically. Identification is based on partial acid-fastness, colony morphology, and 16S rRNA gene sequence analysis Rhodococcus: slimy, salmon-pink colonies ► Rhodococcus: slimy, salmon-pink colonies Gordonia: smooth, beige to salmon-pink colonies ► Gordonia: smooth, beige to salmon-pink colonies Tsukamurella: cerebroid, cream colonies ► Tsukamurella: cerebroid, cream colonies

16 Anaerobic Actinomyces: Identification Actinomyces israelii is anaerobic with clinical strains varying from obligate anaerobes to microaerophilic ► Actinomyces israelii is anaerobic with clinical strains varying from obligate anaerobes to microaerophilic A. israelii ► A. israelii definitively is identified by detection using gas liquid chromatography (GLC) of acetic and lactic acid as end products of carbohydrate metabolism

17 Actinomycosis There are at least five (5) types of actinomycosis ► Cervicofacial actinomycosis Thoracic actinomycosis ► Thoracic actinomycosis Abdominal actinomycosis ► Abdominal actinomycosis Pelvic actinomycosis ► Pelvic actinomycosis Generalized actinomycosis ► Generalized actinomycosis

18 Actinomycosis Cervicofacial actinomycosis occurs in the mouth, neck and head region. ► Cervicofacial actinomycosis occurs in the mouth, neck and head region. The bacterium enters through the periodontium soft tissue wounds or salivary glands. ► The bacterium enters through the periodontium soft tissue wounds or salivary glands. Cervicofacial actinomycosis develops slowly. The area becomes hard, the overlying skin becomes reddish and swelling appears in the mouth and neck. ► Cervicofacial actinomycosis develops slowly. The area becomes hard, the overlying skin becomes reddish and swelling appears in the mouth and neck. Abscesses develop within and eventually drain to the surface where sulfur granules,masses of filamentous organisms, may be found in the pus. ► Abscesses develop within and eventually drain to the surface where sulfur granules,masses of filamentous organisms, may be found in the pus.

19 Actinomycosis Thoracic actinomycosis involves the lungs and mediastinum ► Thoracic actinomycosis involves the lungs and mediastinum The disease begins with fever, cough, and sputum production. The patient becomes weak, loses weight and may have night sweats and shortness of breath. ► The disease begins with fever, cough, and sputum production. The patient becomes weak, loses weight and may have night sweats and shortness of breath. Cervicofacial and thoracic disease may result in nervous system complications ; most commonly brain abscesses or meningitis. ► Cervicofacial and thoracic disease may result in nervous system complications ; most commonly brain abscesses or meningitis.

20 Actinomycosis Abdominal actinomycosis are mostly preceded by surgery. ► Abdominal actinomycosis are mostly preceded by surgery. Infection usually begins in the gastrointestinal tract and spreads to the abdominal wall. ► Infection usually begins in the gastrointestinal tract and spreads to the abdominal wall. Fever and chills, intestinal colic, vomiting, and weight loss, a palpable (can be felt) mass and an external sinus are evident in this type of actinomycosis. ► Fever and chills, intestinal colic, vomiting, and weight loss, a palpable (can be felt) mass and an external sinus are evident in this type of actinomycosis.

21 Actinomycosis Pelvic actinomycosis affects the women's pelvic area and may cause lower abdominal pain, fever, and bleeding between menstrual periods. This form of the infection has been associated with the use of IUDs (intra-uterine devices) that do not contain copper. ► Pelvic actinomycosis affects the women's pelvic area and may cause lower abdominal pain, fever, and bleeding between menstrual periods. This form of the infection has been associated with the use of IUDs (intra-uterine devices) that do not contain copper. Generalized actinomycosis may involve the skin, brain, liver and urogenital system. ► Generalized actinomycosis may involve the skin, brain, liver and urogenital system.

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23 Treatment Treatment for actinomycosis is long term, generally with up to one month of intravenous penicillin G, followed by weeks to months of penicillin taken by mouth. ► Treatment for actinomycosis is long term, generally with up to one month of intravenous penicillin G, followed by weeks to months of penicillin taken by mouth. Additionally, surgical excision and drainage of abscesses may be necessary. ► Additionally, surgical excision and drainage of abscesses may be necessary.

24 NOCARDIA SP

25 Named after Edmond ►Named after Edmond Nocard, Nocard, In 1888 described the ► In 1888 described the organism in cattle organism in cattle First human case of ► First human case of Nocardiosis was Nocardiosis was reported in 1890 reported in 1890 by Eppinger. by Eppinger.

26 NOCARDIA :Classification ► Gram-positive bacteria. ► On microscopy have branching filamentous cells. ► Members of the group are often only distantly related phylogenetically. ► Part of a subgroup of aerobic nocardiform actinomycetes includes: Mycobacterium, Corynebacterium, Nocardia, Rhodococcus, Gordona, and Tsukamurella and the cause of Whipple's disease (Tropheryma whippeli).

27 NOCARDIA :Classification ► Standard laboratory techniques are limited in their ability to differentiate these organisms. ► Molecular genetics have identified at least 30 species, 13 of which cause human infection. Nocardia asteroides sensu stricto, Nocardia farcinica, Nocardia nova, Nocardia brasiliensis, Nocardia pseudobrasiliensis, ► The more common human pathogen are Nocardia asteroides sensu stricto, Nocardia farcinica, Nocardia nova, Nocardia brasiliensis, Nocardia pseudobrasiliensis, Nocardia otitidiscaviarum, and Nocardia transvalensis. Nocardia otitidiscaviarum, and Nocardia transvalensis.

28 NOCARDIA :Epidemiology Nocardia is everywhere in the environment: soil, organic matter, and water. ► Nocardia is everywhere in the environment: soil, organic matter, and water. Human infection usually occurs from minor trauma and direct inoculation of the skin or soft tissues or by inhalation. It is also a common animal infection ► Human infection usually occurs from minor trauma and direct inoculation of the skin or soft tissues or by inhalation. It is also a common animal infection Outbreaks in oncology and transplant wards and surgical wounds have occurred from fomites, hospital construction with resultant contaminated dust, and health care worker hands. ► Outbreaks in oncology and transplant wards and surgical wounds have occurred from fomites, hospital construction with resultant contaminated dust, and health care worker hands.

29 NOCARDIA:Characteristics Branching, beaded, filamentous bacteria ► Branching, beaded, filamentous bacteria n Nocardial mycetomas,it can cause "Sulfur granules" like actinomycosis. ►In Nocardial mycetomas,it can cause "Sulfur granules" like actinomycosis. Stains acid fast in tissue. ► Stains acid fast in tissue.

30 NOCARDIA:Virulence Virulent strains are relatively resistant to neutrophil- mediated killing. ► Virulent strains are relatively resistant to neutrophil- mediated killing. Organisms in the logarithmic growth phase are more toxic to macrophages. ► Organisms in the logarithmic growth phase are more toxic to macrophages. Inhibit phagosome-lysosome fusion more successfully in vitro, which gives rise to L-forms, which can survive in macrophages for days ► Inhibit phagosome-lysosome fusion more successfully in vitro, which gives rise to L-forms, which can survive in macrophages for days L-forms have been found in human and animal infections and perhaps account for treatment failure. ► L-forms have been found in human and animal infections and perhaps account for treatment failure.

31 NOCARDIA:Virulence There are species tissue tropism's: There are species tissue tropism's: N. asteroides complex including ► N. asteroides complex including N. farcinica cause 80% of noncutaneous invasive disease and most systemic and CNS (Central Nervous System) disease. N. brasiliensis: Cutaneous and lymphocutaneous disease. ► N. brasiliensis: Cutaneous and lymphocutaneous disease. N. pseudobrasiliensis: Systemic infections, including the CNS. ► N. pseudobrasiliensis: Systemic infections, including the CNS. N. transvalensis and N. otitidiscavarium: Noncutaneous disease ► N. transvalensis and N. otitidiscavarium: Noncutaneous disease

32 NOCARDIA:Diagnosis Stains show gram-positive, branching filaments, that are usually acid fast. ► Stains show gram-positive, branching filaments, that are usually acid fast.

33 NOCARDIA:Diagnosis Nocardia organisms grew in standard blood culture media in prolonged incubation

34 NOCARDIA:Lab Diagnosis Typical colonies are pigmented,cerebriform colonies and/or white colonies and are usually seen from 3 to 5 days. ► Typical colonies are pigmented,cerebriform colonies and/or white colonies and are usually seen from 3 to 5 days. Biochemical testing and antibiotic resistance patterns can differentiate some species. ► Biochemical testing and antibiotic resistance patterns can differentiate some species. PCR and 16S rRNA sequencing are the most reliable for giving a precise identification. ► PCR and 16S rRNA sequencing are the most reliable for giving a precise identification.

35 Nocardia on blood agar

36 Risk Factors for Nocardiosis Immunocompromise host: 60% of all reported nocardiosis is associated with preexisting immune dysfunction. ► Immunocompromise host: 60% of all reported nocardiosis is associated with preexisting immune dysfunction. Organ transplantation, hematologic malignancy, alcoholism, steroid use, diabetes, acquired immunodeficiency syndrome (AIDS). ►Organ transplantation, hematologic malignancy, alcoholism, steroid use, diabetes, acquired immunodeficiency syndrome (AIDS). and Patients with chronic pulmonary disorders are in risk.

37 Clinical Syndromes: Mucocutaneous Can occur after minor trauma and animal or insect bites; may also colonize open wounds. ► Can occur after minor trauma and animal or insect bites; may also colonize open wounds. N. brasiliensis commonly causes a progressive cutaneous and lymphocutaneous (sporotrichoid) disease. ► N. brasiliensis commonly causes a progressive cutaneous and lymphocutaneous (sporotrichoid) disease. N. asteroides more commonly causes self-limited infection. ► N. asteroides more commonly causes self-limited infection.

38 Clinical Syndromes: Mucocutaneous Mycetoma: a chronic progressive, destructive disease, occurring days to months after inoculation ► Mycetoma: a chronic progressive, destructive disease, occurring days to months after inoculation Located distally on the limbs (classically the foot) and is present with ► Located distally on the limbs (classically the foot) and is present with Suppurative granulomata Suppurative granulomata Progressive fibrosis and necrosis Progressive fibrosis and necrosis Sinus formation and destruction of adjacent structures, Sinus formation and destruction of adjacent structures, Macroscopically visible infective granules Macroscopically visible infective granules Mimics fungal mycetoma and actinomycetomata Mimics fungal mycetoma and actinomycetomata

39 Mucocutaneous Nocardiosis

40 Clinical Syndromes: Pulmonary ●Pulmonary disease is the most common reported. ● Bacteria colonize sputum of COPD patients. ● Clinical Presentations: endobronchial inflammatory masses pneumonia ► endobronchial inflammatory masses pneumonia lung abscess, ► lung abscess, cavitary disease ► cavitary disease empyema ► empyema pneumonia (often progressive in HIV) ► pneumonia (often progressive in HIV) it can invade through surrounding tissues like actinomycosis ► it can invade through surrounding tissues like actinomycosis

41 Clinical Syndromes Cardiac Conditions ► Cardiac Conditions Nocardia has been highly linked to endocarditis as a main symptom.In recorded cases,it has caused damage to heart valves. Ocular disease ► Ocular disease Very rarely Nocardia cause keratitis,generally after trauma

42 Disseminated Nocardiosis Disseminated infection can occur in very ► Disseminated infection can occur in very immunocompromised patients, through the spreading enzymes possessed by the bacteria. It generally involves both lungs and brain ►It generally involves both lungs and brain Multiple cavitating pulmonary infiltrates develop ► Multiple cavitating pulmonary infiltrates develop Cerebral abscesses arise later ► Cerebral abscesses arise later If untreated,the prognosis is poor for this form of disease ► If untreated,the prognosis is poor for this form of disease

43 Treatment Nocardiosis requires at least 6 months of treatment, preferably with co-trimoxazole or high doses of sulfonamides. ► Nocardiosis requires at least 6 months of treatment, preferably with co-trimoxazole or high doses of sulfonamides. In patients who don’t respond to sulfonamide treatment, other drugs, such as ampicillin, ► In patients who don’t respond to sulfonamide treatment, other drugs, such as ampicillin, erythromycin,or minocycline may be added. erythromycin,or minocycline may be added. Treatment also includes surgical drainage of abscesses and excision of necrotic tissue. ► Treatment also includes surgical drainage of abscesses and excision of necrotic tissue. A new combination drug therapy (sulfonamide, ceftriaxone and amikacin) is also in usage. ► A new combination drug therapy (sulfonamide, ceftriaxone and amikacin) is also in usage.

44 Nocardiosis:Treatment From Mandel et al The Principals and Practice of Infectious disease From Mandel et al The Principals and Practice of Infectious disease Copyright © 2006 Elsevier


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