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Brucellosis
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- 2. Etiology • Brucella: Abortus(Cattle),Melitensis (Sheep,Goat)Suis(Swin), Canis(Dog) • G-Coccobacil • Aerobic, Non-spore forming • Non motile • Blood or Choclate agar
- 3. Epidemiology • Unpasteurized milk •Occupational events
- 4. Pathogenesis • Inoculation inskin ,Eye (Through abrasion or conjunctiva) • Inhalation (Infected aerosol) • Ingestion (Meat, Dairy products) Risk of infection depends 1. Nutritional status 2. Immune status 3. Rout of inoculum 4. Species of brucella
- 5. Pathogenesis • Survive& Replicatewithin phagocytes&Monocytes • Infected macrophages localized within reticuloendothelial system(Granuloma formation in spleen,liver,bone marrow)
- 6. Clinical manifestation Triad: Fever,Arthralgia/Arthritis,Hepatosplenomegaly • + History of animal or food exposure • Acute or insidious symptoms(2-4 wk after inoculation) • Refusal to eat • Refusal to bear weight • Lassitude • FTT • Headache • Inattention/Depression • Abdominal pain • Headache • Diarrhea • Rash • Night sweets • Weakness • Fatigue • Cough • Vomiting • Pharyngitis
- 7. • Fever • Hepatosplenomegally •Arthralgia/Arthritis Sacroiliac,Hip,Ankle,
- 8. Diagnosis • WBC Normalor low • + History of animal or food exposure • Recovering organisms (blood’ bone marrow’..) • Serum agglutination test: >1/160 (Antibody against Abortus ,Melitensis, Suis, but not Canis) • 2ME
- 9. • False positiveSAT Yersinia entrocolitica Vibrio cholerae Francislla tularensis • False negative SAT Prozen effect
- 10. Differential diagnosis • Car-Scratchdisease • Typhoid fever • TB • Fungal infections
- 11. Treatment > or =9 years old • 1- Doxycycline 200 mg/D PO 6 WK + Streptomycin 1 g/D IM 1-2 WK OR Gentamycin 3-5 mg/kg/d IM/IV 1-2 WK -------------------------------------------------- • 2- Doxycycline 200 mg/D PO 6 WK + Rifampin 600-900 mg/D PO 6 WK < 9 years old TMP-SMZ: po 45 days (TMP 10 mg/Kg/D) (SMZ 50 mg/KG/D) + Rifampin 15-20 mg/kg/D PO 45 days Meningitis,Osteomyelitis,Endocarditis: Doxy + Genta +/- Rifampin
- 12. calcified brucellomas inboth kidneys calcified brucellomas in the spleen
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- 14. Etiology Salmonellae (G- ‘Facultative’Bacilli) • Antigens: Flagellum(H)’Cell wall(O)’ Envelope(Vi) • Serogroups on the basis of O antigen: A’ B’ C1’ C2’ D’ E • Serotypes: S.Typhi’ S.Paratyphi’…. • Transmission: Water’ Food(beef’poultry’milk’egg’..)
- 15. Salmonella Gastroentritis (Nontyphoidal) Epidemiology •Age: <4 y/o (< 1y/o) • Source of infection: Poultry’eggs’ egg product ’meats’ pet reptile • Transmission: Carrier (Human) • Incubation period: 6-72 hr. (usually less than 24 hr.) • Peak incidence: Late summer &Early fall
- 16. Pathogenesis • Ingestion • Attachedto “M” cells • Phagocytosed by macrophages • Replication • Bacteremia
- 17. Clinical manifestations • Selflimited diseases: 3-7 days • Onset: Abrupt • Nausea’ Vomiting’ Crampy abdominal pain • Loose watery stool • Malaise’ headache’ chills • Fever 38-38.9 c (70%) for 48 hour
- 18. At risk ofcomplications • Impaired immune function(T-Cell) • HIV infection • Organ transplantation • Lymphoproliferative diseases • Hemoglobinopathies (Sickle cell disease’..) • CGD • Malaria • Very old or very young
- 19. Complications • Dehydration’Shock • Localizedinfection: Pneumonia Empyema Abscesses Osteomyelitis Septic arthritis Postinfectious arthritis Pyelonephritis meningitis
- 20. Diagnosis • Cultures (Stool’Blood’ Urine’ Bone marrow’ CSF’…)
- 21. Treatment • Correction ofshock’ dehydration’… • Antibiotics: 1-Infants < 3 mo. 2-Child with immunodeficiency’ Malnutrition Malignancy’ Intravascular catheter or other foreign material
- 22. Treatment • Ceftriaxone orCefotaxime Septicemia’ Enteric fever’ Metastatic site of infection • Amoxicillin • Co-trimaxozole • Fluroqinolones • Chloramphenicol
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- 26. Typhoid fever • InUS:400 Cases per year &Usually under 20 y/o • Worldwide:16 million cases per year and 600’000 death • Infected only human
- 27. Pathogenesis • Invasions onupper small intestine • Monocyte phagocyte • Monocyte carry organism from blood to other RES • Organism proliferation • Lymph node’ liver & spleen inflammation • Secondary septicemia
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- 30. Clinical manifestation • Infant: mildGE to severe septicemia without diarrhea Fever’ hepatomegaly ’ jaundice’ anorexia’ lethargy’ weight loss
- 31. Clinical manifestation • Child: Highfever’ malaise ’lethargy’ myalgia’ headache’ rash’ Hepatomegaly’ abdominal pain and tenderness’ diarrhea(50%)’ constipation obtunded ’delirium’ confusion ’splenomegaly’ Macular (Rose spot) or Maculopapolar rash(30%) High T with low PR (Typically each 1 degree above 38.3° C Rise PR 10/min)
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- 34. Complications • Intestinal perforation(0.5-3%) •Severe GI hemorrhage(1-10%) • Toxic encephalopathy • Cerebral thrombosis • Acute cerebral ataxia • Aphasia • Optic neuritis • Deafness • Transverse myelitis • Acute cholecystitis • Pneumonia • Pyelonephritic • Endocarditis • Meningitis • Osteomyelitis • Septic arthritis
- 35. Dense chronic bonereaction due to typhoid osteomyelitis.There is a central sequestrum
- 36.
- 37. Diagnosis & Differentialdiagnosis • Diagnosis Cultures: Blood’ Urine’ Stool’ Bone marrow’ Lymph nodes’ Deudenal fluied’ Reticuloendothelial tissue’ • Differential diagnosis Bronchitis Bronchopneumonia Gastroenteritis Influenza
- 38. Treatment Drugs: • Ceftriaxone • Ampicillin •Chloramphenicol • Co-Trimoxozole • Ciprofloxacin • Azithromycin Surgery • Cholecystectomy
- 39. Prognosis • With treatment: Mortality <1% • Without treatment : Relapse up to 10% • Chronic carrier: Excrete S.typhi for more than 3 mo.