Infectious disease Flashcards
(107 cards)
What class of antibiotic is Meropenem? what is it effective against?
Meropenem is a β-lactam antibiotic of the carbapenem class with a wide spectrum, active against many aerobic and anaerobic gram-positive (except MRS and MREnterococcus species) and gram-negative bacteria and it is relatively stable against the hydrolysis of many β-lactamases. Carbapenems are more potent bactericidal and have longer post-antibiotic effect than other β-lactams because they bind to PBP-1 and PBP-2. PK studies have been done in cats at 10mg/kg
Name a side effect of minocycline in cats? what dose is recommended based on PK studies?
Vomiting. Dose 8.8mg/kg q 24hour
Does sucralfate affect the bioavailability of ciprofloxacin or enrofloxacin? Does delayed administration improve?
JVIM 2015: Ciprofloxacin is reduced, to 48%. Delaying sucralfate by 2 hours improves bioavailability
What sort of serological testing is used for Bartonella. What is the reported Sn and Sp? Does testing for more strains improve?
IFA testing. JVIM 2018: Sn 62, Sp 85%. Lack of agreement with PCR. IFA panels is technically time consuming, increases the cost of diagnostic testing and, based upon the results of our study, does not substantially enhance overall diagnostic sensitivity.
What clinical syndromes have been associated with Bartonella rochalimae?
JVIM 2020: Endocarditis, lameness, antibiotic responsive polyarthropathy and seizures
What is the agent that causes Lyme disease? How is it transmitted? Name a test to diagnose. What types of vaccines exist against it?
Borrelia bugdorferi sensu lato. Transmitted by Ixodes ticks. Serology; C6 assay. Vaccines include bacterin (lysed spirochetes) or subunit (often OspA and OspC proteins)
What type of pathogen is brucella Canis? what testing is available?
Gram negative bacteria. Serology is available (rapid slide agglutination, gel immunodiffusion) but can take up to 12 weeks to seroconvert. PCR good Sn and Sp but expensive. Blood culture and fluid culture options (zoonotic risk)
What is a common bacteria reported in IVC cultures? What factors are associated with IV complications?
JVIM 2018: Acinetobacter. Association with junior staff and steroidal anti inflammatories
Do whole blood units have a good sanitary shelf life during commercial storage (42 days)
JVIM 2016; Yes. Most organisms detected via PCR were not implicated in reactions. Very low numbers of genome equivalents
What type of organism is Rhodococcus equi? What is the clinical syndrome reported in cats?
Aerobic, intracellular, gram positive coccobacillus. Pulmonary disease common; alveolar lung changes, pleural effusion, pneumothorax - pyogranulomarous lesions. Cutaneous lesions, hepatomegaly. Mortality 67%. Azithromycin and fluoroquinolones usually effective
What is the incidence of owner reported adverse events post leptospirosis vaccination?
JAVMA 2015: 53/10,000 dogs (compared to 26.3 for other vaccines). Hypersensitivity rare (6.3/10000). Safe vaccine
What coagulation disorders are documented in leptospirosis? what is the prognostic significance?
JVIM 2017: Anaemia, thrombocytopenia, hyperfibrinogenaemia. TEM profiles can be hyper or hypo coagulable. Hypocoagulable associated with worse prognosis (Mortality 57% for hypocoagulable vs 21% for hyper coagulable)
What are the two main pathogenic leptospirosis species? What antigen is used for serotyping?
L interrogans and L kirschneri. O antigen
What were the findings by JVIM 2018 regarding 3 serological methods (poc and MAT) for leptospirosis testing in experimentally infected dogs?
Seroconversion was detected in all dogs by day 10 by Witness. SNAP did not perform well (only detected 3). witnesses identified dogs earlier than the MAT
How can PCR be used to identify leptospirosis serovar? JAVMA 2016, which was the most common serovar in USA dogs?
Variable number tandem repeat analysis can be used on the DNA confirmed through PCR. L. grippotyphosa was most common (80%)
What type of bacteria is Listeria? Name a clinical syndrome described in cats
Facultative anaerobe, gram positive bacillus. Saprophytic. Rare cause of mesenteric lymphadenitis in cats. Possible association with raw meat.
A JAVMA meta analysis in 2017 found mycoplasma was associated with a. URT or b. LRT disease in cats? What was this dependent on?
URT disease, providing non shelter cat (asymptomatic carriage in shelter cats)
Which mycoplasma was found to be associated with LRT disease in dogs? Name a commensal.
JVIM 2019. M cynos considered a pathogen. M canis considered commensal.
What is the mechanism of action of fluoroquinolones? Are they bacteriostatic/cidal?
Blocks DNA replication via blocking DNA topoisomerase IV or gyrase (3rd generation do both). Bacteriocidal
What is the mechanism of action of tetracyclines?
Blocks tRNA access to the 30s ribosomes. Bacteriostatic
What are some differences between dogs presenting for anaphylaxis and sepsis?
JAVMA 2017: Anaphylaxis: higher Eo, higher ALT, lower pH. Sepsis: higher bands, higher ALP, higher globulins, lower glucose
What is MALDI-TOF used for?
Bacterial identification via protein patterns and mass spectrometry. Can provide rapid identification
What is cfDNA and nucleosomes? what may be evaluated in and what significance do they have?
Cell free DNA (released from dying cells or NETs) and nucleosomes (DNA + histone proteins - also a cellular content). Markers of cell death and NETs and so can be used in sepsis/SIRS. JVECC 2019: cfDNA higher in dogs with sepsis/SIRS than healthy controls. Nucleosomes higher in sepsis compared to controls. Ratio of cfDNA to neutrophil count higher in non survivors.
What glucose difference between plasma and peritoneal fluid supports a septic abdomen?
JAVMA 2015: 38g/dl (2.1 mmo/L) between plasma and peritoneal fluid. Whole blood was less sensitive (41%) but 100% specific