lNOCARDIA  Dr.T.V.Rao MD      Dr.T.V.Rao MD   1
Edmond Nocard - Nocardia                   • Named after Edmond                     Nocard,                   • in 1888 de...
What are Nocardia• Nocardia is a genus of weakly staining  Gram-positive, catalase-positive, rod-  shaped bacteria. It for...
Nocardia• Genus : aerobic Actinomyctes         G+ branching filamentous bacteria• Subgroup: aerobic nocardiform actinomyce...
Nocardia :ECOLOGY& EPIDEMIOLOGY• Ubiquitous environmental saprophyte• Soil, organic matter, water• Tropical and subtropica...
Nocardia is present as commensal In              Humans                        • Nocardia are found                       ...
Other Species of Nocardia• Gram-positive bacteria.• On microscopy have branching filamentous  cells. The more common human...
Microbiology• Branching, beaded,  filamentous bacteria• Can cause "Sulfur  granules" like  actinomycosis, in  nocardial  m...
Nocardia :ECOLOGY& EPIDEMIOLOGY                 • The risk of pulmonary or• Transmission      disseminated disease        ...
General approach to Diagnose the      Infection with Nocardia• Bronchial wash specimens sent to laboratory  were to be exa...
Microscopy and Culturing essential    for establishing Diagnosis               Dr.T.V.Rao MD         11
Transmission• Pulmonary,  disseminated and CNS  infections are acquired  through inhalation;  primary cutaneous  disease i...
Risk Factors• Immunocompromised: 60% of all reported  nocardiosis is associated with preexisting immune  dysfunction.• Org...
Virulence Factors• Virulent strains are relatively resistant to neutrophil-  mediated killing.• Organisms in the logarithm...
Virulence Factors• The inability to be killed my normal white cells  takes on additional significance in the  immunoincomp...
Virulence Factors• There are species tissue tropisms: – N. asteroides complex including N. farcinica cause   80% of noncut...
Clinical presentation of Nocardia• Overall, 80% of nocardiosis cases present  as invasive pulmonary infection,  disseminat...
Clinical Syndromes: mucocutaneous• Can occur after minor trauma and animal or  insect bites; may also colonize open wounds...
CLINICAL MANIFESTATIONS                     : Main form•   Lymphocutaneous syndrome•   Pulmonary :Pneumonia•   CNS : Brain...
Nocardial actinomycetoma swelling,       multiple sinus tracts,               Dr.T.V.Rao MD         20
Clinical Syndromes: Mucocutaneous• Mycetoma: a chronic progressive, destructive  disease, occurring days to months after i...
Lymphocutaneous syndrome                -Cellulitis                -Lymphocutaneous syndrome                -Actinomycetom...
Clinical Syndromes: pulmonary• Clinical Presentations: – endobronchial inflammatory masses pneumonia – lung abscess, – cav...
Pulmonary disease• Pneumonia      Subacute(more acute in immunosuppressed)      Cough**       Small amounts of thick, puru...
CNS : Brain abscess• Insidious presentations : mistaken for neoplasia !!!• Granulomatous , abscesses• Cerebral cortex, bas...
Nocardiosis can manifest in any region• Local findings associated with metastatic  abscesses may be present at almost any ...
LABORATORY DIAGNOSIS• Gram-positive, beaded, branching filaments  usually weak acid fast+ve .• Standard blood culture :48 ...
Culturing of Nocardia• Plate culture of  the bacteria  Nocardia  asteroides grown  on 7H10 agar  plates at 37° C.• Photo c...
Specific Methods in Diagnosis• specimens with mixed flora can over grow the  Nocardia colonies• Selective media may increa...
Diagnosis• Slow growing, Nocardia may take from 48  hours to several weeks.• typical colonies are buff or pigmented waxy  ...
Treatment• I&D depending of the location• reversal of immunosuppression• sulfas the mainstay of therapy, but susceptibilit...
Treatment• Long-term antibiotic therapy (usually  with sulphonamides) for 6 months to a  year (or longer depending on the ...
MANAGEMENT               Medication• TMP-SMX :currently preferred :drugs in serum:CSF = 1:20 :high MICs good therapeutic...
Treatment: duration• Expect a clinical response in 3 - 10 days• Duration is until cure.• Often 3-6 months total treatment....
Epidemiology• Nocardia is everywhere in the environment: soil,  organic matter, and water.• Human infection usually occurs...
• Programme Created by Dr.T.V.Rao MDfor Medical and Paramedical Students in         the Developing World              • Em...
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Nocardia

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Nocardia

  1. 1. lNOCARDIA Dr.T.V.Rao MD Dr.T.V.Rao MD 1
  2. 2. Edmond Nocard - Nocardia • Named after Edmond Nocard, • in 1888 described the organism in cattle with bovine farcy. • First human case of nocardiosis was reported in 1890 by Eppinger. Dr.T.V.Rao MD 2
  3. 3. What are Nocardia• Nocardia is a genus of weakly staining Gram-positive, catalase-positive, rod- shaped bacteria. It forms partially acid- fast beaded branching filaments (acting as fungi, but being truly bacteria). It has a total of 85 species. Some species are non-pathogenic while others are responsible for nocardiosis. Dr.T.V.Rao MD 3
  4. 4. Nocardia• Genus : aerobic Actinomyctes G+ branching filamentous bacteria• Subgroup: aerobic nocardiform actinomycetes -Mycobacterium -Corynebacterium -Nocardia -Rhodococcus -Gordona -Tsukamurella Dr.T.V.Rao MD 4
  5. 5. Nocardia :ECOLOGY& EPIDEMIOLOGY• Ubiquitous environmental saprophyte• Soil, organic matter, water• Tropical and subtropical regions :Mexico, Central and South America, Africa and India Dr.T.V.Rao MD 5
  6. 6. Nocardia is present as commensal In Humans • Nocardia are found worldwide in soil that is rich with organic matter. In addition, Nocardia are oral microflora found in healthy gingiva as well as periodontal pockets. Most Nocardia infections are acquired by inhalation of the bacteria or through traumatic introduction. Dr.T.V.Rao MD 6
  7. 7. Other Species of Nocardia• Gram-positive bacteria.• On microscopy have branching filamentous cells. The more common human pathogen are Nocardia asteroids sensu stricto, Nocardia farcinica, Nocardia nova, Nocardia brasiliensis, Nocardia pseudobrasiliensis, Nocardia otitidiscaviarum, and Nocardia transvalensis• Dr.T.V.Rao MD 7
  8. 8. Microbiology• Branching, beaded, filamentous bacteria• Can cause "Sulfur granules" like actinomycosis, in nocardial mycetomas.• Stains acid fast in tissue unlike the Actinomyces. Dr.T.V.Rao MD 8
  9. 9. Nocardia :ECOLOGY& EPIDEMIOLOGY • The risk of pulmonary or• Transmission disseminated disease *deficient cell-mediated * -Alcoholism• Inhalation -Diabetes -Lymphoma• Skin -Transplantation -Glucocorticoid therapy -AIDS CD4+ < 250
  10. 10. General approach to Diagnose the Infection with Nocardia• Bronchial wash specimens sent to laboratory were to be examined microscopically by gram stain. If numerous gram positive branching bacilli were observed raising suspicion of Nocardia. A partial acid-fast stain will confirm suspicions that the organism was indeed partially acid-fast and consistent with Nocardia. Gram stain results and presumptive diagnosis were to be reported Dr.T.V.Rao MD 10
  11. 11. Microscopy and Culturing essential for establishing Diagnosis Dr.T.V.Rao MD 11
  12. 12. Transmission• Pulmonary, disseminated and CNS infections are acquired through inhalation; primary cutaneous disease is acquired through inoculation of the skin. Rarely, nosocomial postsurgical transmission occurs. Dr.T.V.Rao MD 12
  13. 13. Risk Factors• Immunocompromised: 60% of all reported nocardiosis is associated with preexisting immune dysfunction.• Organ transplantation, hematologic malignancy, alcoholism, steroid use, diabetes, acquired immunodeficiency syndrome (AIDS).• Patients with chronic pulmonary disorders, especially, pulmonary alveolar proteinosis,• Given its ubiquity in the environment and the increasing numbers of poor hosts, this organism should become increasingly common. Dr.T.V.Rao MD 13
  14. 14. Virulence Factors• Virulent strains are relatively resistant to neutrophil- mediated killing.• 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• L-forms have been found human and animal infections and perhaps account for treatment failure.
  15. 15. Virulence Factors• The inability to be killed my normal white cells takes on additional significance in the immunoincompetant who have WBC dysfunction that tips the battle between host and pathogen in favor of the Nocardia.• Patients with CGD have increased risk for Nocardia infections, a double whammy where the patients cannot generate an oxidative burst and some strains have the ability to make superoxide dismutase,
  16. 16. Virulence Factors• There are species tissue tropisms: – N. asteroides complex including N. farcinica cause 80% of noncutaneous invasive disease and for most systemic and CNS disease. – N. brasiliensis: cutaneous and lymphocutaneous disease. – N. pseudobrasiliensis: systemic infections, including the CNS. – N. transvalensis and N. otitidiscavarium: Noncutaneous disease
  17. 17. Clinical presentation of Nocardia• Overall, 80% of nocardiosis cases present as invasive pulmonary infection, disseminated infection, or brain abscess; 20% present as cellulitis. Pulmonary infection commonly presents with fever, cough, or chest pain. Central nervous system (CNS) symptoms include headache, lethargy, confusion, seizures, or sudden onset of neurologic deficit. Dr.T.V.Rao MD 17
  18. 18. Clinical Syndromes: mucocutaneous• Can occur after minor trauma and animal or insect bites; may also colonize open wounds.• Often in normal hosts.• Misdiagnosis common.• N. brasiliensis commonly causes a progressive cutaneous and lymphocutaneous (sporotrichoid) disease. – presents as an ascending nodules• N. asteroides more commonly causes self- Dr.T.V.Rao MD 18 limited infection.
  19. 19. CLINICAL MANIFESTATIONS : Main form• Lymphocutaneous syndrome• Pulmonary :Pneumonia• CNS : Brain abscess• Disseminated disease CNS Eyes (particularly the retina Keratitis), Skin& subcutaneous Kidneys, Joints, bone Heart Dr.T.V.Rao MD 19
  20. 20. Nocardial actinomycetoma swelling, multiple sinus tracts, Dr.T.V.Rao MD 20
  21. 21. Clinical Syndromes: Mucocutaneous• Mycetoma: a chronic progressive, destructive disease, occurring days to months after inoculation• located distally on the limbs (classically the foot) and presents with – Suppurative granulomata – progressive fibrosis and necrosis – sinus formation and destruction of adjacent structures, – macroscopically visible infective granules – Mimics fungal mycetoma and actinomycetomata (due to actinomycete). – Dr.T.V.Rao MD 21
  22. 22. Lymphocutaneous syndrome -Cellulitis -Lymphocutaneous syndrome -Actinomycetoma• Ubiquitous in soil inoculation injuries,• Insect and animal bites contaminated abrasions• N. brasiliensis : most common• N. asteroides : self-limited• Because initial response Rx as staphylococcus underdiagnosed Mycetoma• Days to months ,typical:distal limb Dr.T.V.Rao MD 22
  23. 23. Clinical Syndromes: pulmonary• Clinical Presentations: – endobronchial inflammatory masses pneumonia – lung abscess, – cavitary disease – empyema – pneumonia (often progressive in HIV) – it can invade through surrounding tissues like actinomycosis – Dr.T.V.Rao MD 23
  24. 24. Pulmonary disease• Pneumonia Subacute(more acute in immunosuppressed) Cough** Small amounts of thick, purulent sputum Fever, anorexia, weight loss, malaise• Endobronchial inflammatory mass• Lung abscess• Cavitary disease• Inadequate therapy Progressive fibrotic disease• Cerebral imaging, should be performed in all cases of pulmonary and disseminated nocardiosis Dr.T.V.Rao MD 24
  25. 25. CNS : Brain abscess• Insidious presentations : mistaken for neoplasia !!!• Granulomatous , abscesses• Cerebral cortex, basal ganglia and midbrain***• Less commonly: spinal cord or meninges.• Brain tissue diagnosis in pulmonary nocardiosis : not necessary• However, cerebral biopsy: considered early in immunocompromised Dr.T.V.Rao MD 25
  26. 26. Nocardiosis can manifest in any region• Local findings associated with metastatic abscesses may be present at almost any site but are typically in the lower extremities. The combination of pneumonia and lower-extremity abscess is particularly suggestive of nocardiosis, although this is not seen exclusively in nocardiosis.• Patients with brain abscess may present with altered mental status, personality changes, or various localizing neurologic findings. Dr.T.V.Rao MD 26
  27. 27. LABORATORY DIAGNOSIS• Gram-positive, beaded, branching filaments usually weak acid fast+ve .• Standard blood culture :48 hrs. to several wks., but typical = 3 to 5 days• Colonization of sputum :underlying pulmonary dz + not receiving steroid therapy no specific therapy• Susceptibility testing -Deep-seated /disseminated dz. fail initial therapy -Relapse after therapy -Alternatives to sulfonamides are being considered Dr.T.V.Rao MD 27
  28. 28. Culturing of Nocardia• Plate culture of the bacteria Nocardia asteroides grown on 7H10 agar plates at 37° C.• Photo courtesy• CDC/Dr.William Kaplan Dr.T.V.Rao MD 28
  29. 29. Specific Methods in Diagnosis• specimens with mixed flora can over grow the Nocardia colonies• Selective media may increase yield: – Thayer-Martin agar with antibiotics – paraffin agar. – Buffered charcoal-yeast extract (BCYE) medium – Decontamination methods used for mycobacterial culture kill Nocardia and may decrease culture yield. Dr.T.V.Rao MD 29
  30. 30. Diagnosis• Slow growing, Nocardia may take from 48 hours to several weeks.• typical colonies are buff or pigmented waxy cerebriform colonies and/or as chalky white and are usually seen from 3 to 5 days.• biochemical testing and antibiotic resistance patterns can differentiate some species, but PCR83,84 and 16S rRNA sequencing are the most reliable for giving a precise spp. Dr.T.V.Rao MD 30
  31. 31. Treatment• I&D depending of the location• reversal of immunosuppression• sulfas the mainstay of therapy, but susceptibilities vary; for example N. farcinica usually resistant to third generation cephalosporins• sulfonamide mono therapy in immuno competent or severe disease has a 50% mortality rate• in vitro sensitivity and resistance does not predict in vivo response• send for susceptibility testing is reasonable Dr.T.V.Rao MD 31
  32. 32. Treatment• Long-term antibiotic therapy (usually with sulphonamides) for 6 months to a year (or longer depending on the individual and the parts of the body involved) is needed to treat Nocardia. Frequently, chronic suppressive therapy (long-term, low-dose antibiotic therapy) is needed. Dr.T.V.Rao MD 32
  33. 33. MANAGEMENT Medication• TMP-SMX :currently preferred :drugs in serum:CSF = 1:20 :high MICs good therapeutic responses -General:5-10 mg/kgTMP & 25-50 mg/kgSMX divide2- 4times -Cerebral abscesses,severe,disseminated,AIDS :15 mg/kg TMP and 75 mg/kg SMX) -Cutaneous infection: 5 mg/kg/day (TMP) + DB Dr.T.V.Rao MD 33
  34. 34. Treatment: duration• Expect a clinical response in 3 - 10 days• Duration is until cure.• Often 3-6 months total treatment.• Cutaneous disease usually is cured in a month or two• Non CNS disease is usually treated for 6 months; CNS disease is treated for a year.• Relapses can occur up to a year after stopping therapy; AIDS patient and perhaps other immuno incompetent should be maintained on lifelong suppressive TMP/SULFA
  35. 35. Epidemiology• 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• Outbreaks in oncology and transplant wards and surgical wounds have occurred from fomites, hospital construction with resultant contaminated dust, and health care worker hands. Dr.T.V.Rao MD 35
  36. 36. • Programme Created by Dr.T.V.Rao MDfor Medical and Paramedical Students in the Developing World • Email • doctortvrao@gmail.com Dr.T.V.Rao MD 36
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