PPT. questions Prudent use Flashcards
Susceptible testing, main methods:
Disc diffusion method –> CLSI, how many mm diameter
Microdilution method –> Minimal inhibitory concentrations (MIC)
Bacteria pathogens BRDC (ruminants)
GRAM-negative – main causative agents
- Pasteurella multocida A (80-90%)
- Mannheimia haemolytica (80-90%)
- Histophilus somni (5%)
GRAM-positive
- Trueperella pyogenes (50%)
- Mycoplasma bovis
What antibiotic can we use for BRDC in ruminants?
Best options: Florfenicol, Marcolides (tulathromycin, gamitromycin
Against mycoplasma bovis also causing itm(more frequently resistant to antibiotics)
- Fluroquinolones: most effective but highest priority critical microorganism
- Macrolides are also effective : Tulathromycin, gamithromycin, Lincospectin (linco +
spectomycin à synergistic against Mycoplasma)
o Act against M.bovis + fastidious microorganism = good against BRDC!
Lung:plasma
Tilmicosin
Tulathromycin
Gamithromycin
Tildipirosin
Tilmicosin 30-60x (3 days effective conc. in lung)
Tulathromycin 50-180x (6-10 days effective conc. in lung)
Gamithromycin 480X (10-14 days effective conc. in lung)
Tildipirosin 50 (14-28 day effective conc. in lung) –> Not effective against mycoplasma bovis
What Ab have bad distribution?
BAD: penicillin, cephalosporin, aminoglycoside – cannot cross the special barriers, the
penetration in the lungs is bad
OTHER: good or excellent
What can we use against mannheimia hemolytivca and pausterella multocida? Ruminant
Best agent Ceftiofur and Fluroquinolones BUT CIA – prefer the less valuable
drugs as the: Macrolides (tulathromycin, gamithromycin, tilmicosin)
florfenicols
Treatment Interdigital dermatitis (Mortellaro-disease)
Topical treatment! Foot bath 3x a week à montly
o 1. Zinc, copper-sulphate 5% + cationic detergents
o 2. Tetracycline containing spray
Topically – will reach a high concentration at the
given site of infection
Daily for one week à 3x a week for 2 weeks
Interdigital phlegmone (foot rot) treatment?
more severe
o Topical therapy won’t be enough
o Lameness + necrosis
o Systemic antibiotic treatment + NSAID (meloxicam
duration: 2 days, carprofen – longer duration of action 4-5 days)
Foot disease ruminants, AB?
Ceftiofur/Cefquinom: CIA
- Highlight: Lincomycin, Tulathromycin, Cephalosporines, Florfenicol
- Tetracycline ++, in small ru the resistance is good, in Ru (+++)
Calf diarrhea AB treament, mild case?
PER OS o Amoxicillin § Small ru – rare resistance o Fluroquinolones o Aminoglycoside : ∅ Spectinomycin – bacteriostatic – resistance more frequent o Colistin – CIA
Calf diarrhea AB treament, severe case?
PARENTERAL (IV)
Bad absorption with IM, SC due to dehydration
Ceftiofur (high Dosage!)
Amoxicillin (sheep), amoxi-clav (most product is IM or SC, and we need IV –
quick action!)
Fluoroquinolones –> Enro, marbofloxacin
When are cows more sensitve to matsitis
Involution (right after drying off) –> most often G+
Transition (near calving) –> most often G-
Main causative agent of mastitis in cow?
1.Streptococcus uberis
2. e.coli
3.Prototheca zopfii – no effective drugs against this pathogen – those animal infected
are not kept for long
Treatment clinical mastitis:
Serious case –> E.coli, Klebsiella (S. Aureus)
- The main goal: prevention and treatment of bacteremia (40%)
- Bactericidal activity à blood-milk barrier
Fluoroquinolones IV o Marbofloxacin (Withdrawal period: 2d) o Enrofloxacin (WP: 3d)
Tetracyclines IV
o Water-soluble (WP: 3d)
Pot. SA IV (WP: 3d)
+ infusion (Ca!), NSAID!
Intramammary mastitis treatment
oxacillin, cloxaxillin (strep, staph)
ampicillin, cloxacillin (steph, staph, e.coli)
cefalexin, kanamycin ((steph, staph, e.coli)
Amoxicillin + clavulinic acid (steph, staph, e.coli)
cefoperazone (steph, staph, e.coli)
Cefquinome (steph, staph, e.coli)
Major pathogens poultry:
Escherichia coli – does not cause enteritis in poultry!
Pasteurella multocida (fowl cholera)
Ornithobacterium rhinotracheale
Clostrodium perfringens (+ colinum)
Staphylococcus aures
Mycoplasma sp. (sonicia, meleagridis, gallisepticum)
AB not authorised in poultry
category B:> 3 &4 gen. cephalosporins
Category C: 1 &2 gen cephalosporins, and amoxicillin - clavulinic acid.
Narrow spectrum penicillins can treat? (poultry)
Phenoxymethylpenicillin (phenoxypen, phenocillin AUV)
Phenoxymethylpenicillin (phenoxypen, phenocillin AUV)
C. perfringens + other clostridum species
Swine erysipelas
Streptococcosis
Fowl cholera
Broadened spectrum penicillins can treat? (poultry)
Amoxicillin
Fowl cholera (1st choice)
Staphylococcus
enterococcus
ornithobacetrium rhinotracheale
C. perfringens + other clostridum species + Swine erysipelas (use NARROW instead)
Aminoglycosides can treat? (poultry)
Mycoplasma
Neomycin bacteriocidal, but spectinomycin bacteristatic.
Polypeptide antibiotics (poultry) colistin
Category B à use it if no other drugs can be used!
Tetracylines (poultry)
Doxycycline (most potent, better absorption, excellent distribution)
Chlortetracycline (potent) and oxytetracycline
Fowl cholera (p. multocida)
o O. rhinotracheale
o Mycoplasmosis
o Bordetella avium
no toxic interaction with ionophore
Macrolides can treat ? (poultry)
Gram +
§ E. perfingens
§ E. rhusiopathiae
§ Staphylococcus spp
Gram –
§ Mycoplasma gallisepticum, m. synoviae
• Tilmicosin < tylosin < tylvalosin
§ O. rhinotracheale
• Tylosin «_space;tilmicosin < tylvalosin
pasturella multocida & e. coli: Almost total resistance: against?
Macrolides in poultry
Lincosamides can treat ? (poultry)
Combined with spectinomycin
Mycoplasmosis
C. perfringens
Staphylococcosis
Pleuromutilins can treat ? (poultry)
Tiamulin
o Mycoplasmosis
o O. rhinotracheale
o Gram + bacteria, p. multocida: weak
Ionophore interactions
Potentiated sulphonamides can treat ? (poultry)
Ø mycoplasma
Fastidious (P. multocida)
o B. avium
o E. coli
Potentiated sulphonamides side effects
Potentiated sulphonamides
Fluoroquinolones can treat ? (poultry)
Category B - Clinical usage o E. coli + mycoplasma species (CRD) o Fowl cholera o A. paragallinarum o B. avium o O. rhinotracheale: frequent resistance
Fluoroquinolones frequent resistance ? (poultry)
O. rhinotracheale & E. coli
E. coli sensitivity test
- Aminopenicillins: amoxicillin «_space;amoxicillin-clavulenic acid
40-70% vs 1-10% - Aminoglycosides: neomycin, spectinomycin – 20-30%
- Colistin – approx. 5%
- Tetracyclines L - > 40-90%
- Florfenicol – low, < 10%
- Potentiated SA – 25-40%
- Fluoroquinolones – 60-80%
Low sensitivity remains
Category D à normally 1st choice for e. coli but in poultry = no result
Pasteurella multocida (fowl cholera) : most preferred AB
Amoxicillin, florfenicol, doxycycline, potentiated SA
can use enrofloxacin & tylvalosin as well.
Ornithobacterium rhinotracheale: most preferred AB
amoxicillin, doxycycline, florfenicol
Clostridium perfringens: most preferred AB
phenoxymethylpenicillin
can also use: Amoxicillin, tylosin, lincomycin