Clinical Microbiology 2008
Microorganisms as causative agents of infections in animals Companion animals: Dog and cat Horse Food animals Cattle and sheep Pig Poultry
Infections of the.. Respiratory system Nervous system (CNS) Gastro-intestinal tract Urinary tract Genital systém Skin, soft tissues and wounds Joint and bones
Clinical microbiology (microbes and antimicrobials) Bacteriology and use of antibiotics and chemoterapeutics) Virology And use of antivirotics Mycology And use of antimycotics Use of vaccines
Clinical specimens Colleted from living animals not from necropsy
Characterisation of bacteria from clinical specimens Processing of a specimen Gram stain Cultivation Atmosphere (A/AN, A+CO2,AN,A) Culture media (solid:BA, MC agar,XLD agar, chocolate agar, liquid: broths) Identification G+ Gram- negative bacteria (oxidase, catalase, biochemical tests, serological tests to identify serovars
Further identification -Typing methods Serological tests are used for serotyping (E.coli O157 H7, E. coli O141 F4 S. Typhimurium O 1,4,5,12,H: i, 1,2 S. Enteritidis O1,9,12, H:g,m Bacteriophage typing (S. Typimurium DT 104)
Identification – subtyping methods DNA subtyping methods gene typing for virulence factors instead of toxin production E.coli P. multocida
Obligate anaerobic bacteria Bacteroides/Fusobacterium Porphyromonas Prevotella Clostridium perfringens Clostridium difficile
Metods for detection of non- cultured bacteria Microscopy PCR detection using various modifications PCR Nested PCR Real time PCR
Non-cultured bacterial genera and species Lawsonia intracellularis Chlamydophilla spp. Rickketsias Hemomycoplasmas: Mycoplasma hemosuis, M. hemofelis
G- bacterial species most frequently obsereved Psudomonas aeruginosa E. coli Other coliforms (Klebsiella, Enterobacter) Salmonella Pasteurella multocida Haemophilus spp. Actinobacillus spp.
G+ bacterial species most frequently obsereved Beta – haemolytic streptococci Staphylococcus aureus/S.intermedius Coagulase negative staphylococci Enterococci Clostridium perfringens
Zoonotic bacterial species Campylobacter jejuni, C.coli VTEC (verotoxigenic E.coli serogroup O157 Salmonella enterica (ST DT 104) Yersinia enterocolitica Streptococcus suis 2 Listeria moncytogenes
Mycotic infections Candida albicans Dermatophyta
Use of Antibiotics Antibiotic susceptibility testing MIC – minimum inhibitory concentrations Disc susceptibility test Etest Beta-lactamase test
Commonly used antibiotic Range of action: Very good Good Poor activity against particular bacteria Bacterial resistance mechanisms
Betalactams PENICILLINS Benzylpenicillin Aminopenicillins Ampicilin, amoxicilin
Cephalosporines 1 to 4 generation 1g: cephalotin 2g: cefuroxim 3g: ceftazidim 4g: cefquinom
Carbapenems Imipenem
Inhibitors of beta-lactamases Clavulanic acid Sulbactam Combination: co-amoxicillin
Glykopeptides Vancomycin Teicoplanin
Aminoglycosides Streptomycin Gentamicin
Macrolides Erytromycin Tylosin Tilmicosin
Lincosamides Lincomycine
Tetracyclines Oxytetracycline/Chlortetracycline Doxycycline
Amphenicols Chloramphenicol 2.gen. Florfenicol
Pleuromutilins (diterpens) Tiamulin 2gen. Valnemulin
Chemoterapeutics Sulfonamides Quinolones
Sulfonamides Sulfamethoxazol Co- trimoxazol
Quinolones Non fluorinated q. Oxolinic acid Fluorinated q. enrofloxacin
Infections of the Respiratory System Mirobes Pathogenesis (aspiration) Nasopharynx Pharynx (pharyngitis) Trachea Bronchi (bronchioli) Lungs -pneumonia Bronchopneumonia Pleura (pleuritis) Lung absces
Infection of the skin and sof tissues A breatch of the skin Via minor abrasions Hair follicles Surgical incision Wounds (traumatic, surgical)
Infections of the blood Bacteraemia - bacteria in the blood se detected by blood culture Transient (single episode) Intermittent Continuous