Infectious Disease Flashcards
What type of bacteria is Salmonella?
gram negative
How is Salmonella transmitted?
Raw Chicken
Poultry consumption
Raw pet food diets
What are the clinical signs of Salmonella?
Mild to severe gastroenteritis Vomiting Diarrhea - watery to mucoid to hematochezia hypovolemia septic shock Neutropenia
Hematochezia
undigested bloody stool from the colon
How do you diagnose Salmonella?
Fecal culture
How do you treat Salmonella?
Chloramphenicol
Trimethoprim sulphonamide
amoxicillin
ampicillin
Campylobacter
gram negative curved slender motile rod
What are the clinical signs for Campylobacter?
Large bowel diarrhea Mucous tenesmus hematochezia Elevated temperature Leukocytosis
Tenesmus
straining to defecate
How do you diagnose Campylobacter?
Microscopic examinaations: curved gull wing shaped
Culture
PCR
How do you treat Campylobacter?
Erythromycin
Chloramphenicol
Cephalosporins
enrofloxacin
Helicobacter
Gram negative curved spiral bacterium
Where are Helicobacter located?
Stomach
What are the clinical signs of Helicobacter?
Chronic gastritis Chronic vomiting weight loss emaciation diarrhea
How do you diagnose Helicobacter?
Gastric biopsies
Culture
PCR
EM and Molecular evaluation
How do you treat Helicobacter?
Triple therapy - 2 antibiotics and an antacid
Amoxicillin, metronidazole, and omeprazole
Amoxicillin, metronidazole and famotidine
Brucella Canis
gram negative aerobic coccobacillary oragnism
How is Brucella transmitted?
aborted fetal material semen urine milk orally conjunctivally Penetrates the mucous membranes and enters lymphoreticular system, persists intracellularly.
Where do you find the highest concentrations of Brucella?
vaginal discharge
Semen
What are the clinical signs of Brucellosis?
Bacteremia lymphadenopathy transient fevers seizures enlarged scrotum epididymitis infertility testicular atrophy Infertility, abortion and stillborn pups in females Discospondylitis Chorioretinitis optic neuritis anterior uveitis
How do you diagnose Brucellosis?
Hematology: Leukocytosis Hyperglobulinemia with hypoalbuminema CSF: neutrophilic pleocytosis with increased protein levels Serology Rapid Slide agglutination test (RSAT) Tube agglutination test (TAT) AGID ELISA PCR Culture aborted tissues or blood
How long do titers stay positive with Brucellosis?
up to 3 years
What is the treatment for Brucellosis?
Sterilize all infected animals
Actinomyces and Nocardia spp.
Gram positive bacteria
What is Actinomyces associated with?
Anaerobic infections foreign body migrations pyothorax peritonitis bite wounds draining tracts/wounds with yellow granules
What is Nocardia associated with?
Wounds and pyothorax
How do you diagnose Actinomyces and Nocardia?
Cytology and culture
What is the treatment for Actinomyces and Nocardia?
Surgical drainage and debridement
What antibiotics are used for Actinomyces?
Penicillins for 4 weeks
What antibiotics are used for Nocardia?
Trimethroprim sulphonamides for 6 weeks
Borrelia burgdorferi
Spirochete, thin elongated spiral shaped bacteria
What is the host for Borrelia burgdorferi?
Deer tick
Western Black legged tick
How long does the tick have to attached to transmit Borrelia burgdorferi?
48-50 hours
What does Borrelia burgdorferi contain?
Outer surface protein A
Outer Surface protein C
Outer protein A of Borrelia burgdorferi
Help the bacterium adhere to the midgut of infected ticks
Outer protein C of Borrelia burgdorferi
Attaches the bacterium to the hosts skin
Characteristics of Borrelia burgdorferi
can morph from spiral/corkscrew shape to spherical/cystic form
Highly motile due to flagella
Where does Borrelia burgdorferi sequester?
Joints
Fibroblasts
astrocytes
Clinical signs of Borrelia burgdorferi
Small red lesions on skin Fever Shifting leg lameness Renal disease meningitis rheumatoid arthritis
How long does it take for the clinical signs of Borrelia burgdorferi to appear?
2-5 months
What is the most common clinical sign of Borrelia burgdorferi?
Non-erosive polyarthritis
What is used to diagnose non-erosive poly arthritis of Borrelia burgdorferi?
Joint fluid aspiration cytology - increased neutrophils and proteins
What are the clinical signs of Borrelia burgdorferi?
V/D Weight loss PU/PD peripheral edema ascites
What laboratory findings are associated with Borrelia burgdorferi?
Non-reg anemia stress leukogram Thrombocytopenia Azotemia low albumin level hypercholesterolemia hyperphosphatemia Urinanalysis: proteinuria, hematuria, glucosuria, bilirubinuria, and active sediment
What test is used for Borrelia burgdorferi?
C6 Antibody test
Do we treat the dog that tests positive on the C6 snap test and has clinical signs?
Yes
Do we treat the dog that tests positive on the C6 snap test and has no clinical signs?
Controversial
What is the treatment of choice for Borrelia burgdorferi?
Doxycycline for 30 days
How do you prevent Borrelia burgdorferi?
Proper effective tick prevention medication
Vaccinations - 24 weeks apart starting at 12 weeks of age then an annual booster
What are the human clinical signs of Borrelia burgdorferi?
Erythematous rash
Musculoskeletal/ neurological or cardiovascular disease
What are the most common infections in dogs of Leptospirosis?
L. canicola
L. icterohaemorrhagiae
L. grippotyphosa
How is Leptospirosis transmitted?
Direct through infected urine, venereal and placental transfer, bite wounds, or ingestion of infected tissue
Indirect from contaminated water or food or soil
What is the environment for Leptospirosis?
Slow moving warm water
Soil pH neutral or slightly alkaline
Urine with higher pH
Ambient temperatures of 0C to 25C
What is the pathogenesis of Leptospirosis?
Transmitted through mucosal surface, orally, across placenta, through broken skin or by fomites
What is the incubation of Leptospirosis?
3-7 days
Where does Leptospirosis spread to?
Kidney Spleen CNS eyes genital tract
What are the clinical signs of Leptospirosis?
Fever Tachypnea rapid irregular pulse vascular collapse Petechiae Hematemesis hematochezia melena epistaxis Icterus Intestinal intussusception Oliguria/anuria Anorexia Vomiting
Hematemesis
vomiting blood
Hematochezia
bloody stool
Melena
digested bloody black stool
Epistaxis
bleeding from the nose
How do you diagnose Leptospirosis?
Hematology Thoracic radiographs Abdominal Ultrasound Serology: Microscopic agglutination test (repeat sample 2-4 weeks later for titre) PCR Bacterial culture renal biopsy
What do you see on Thoracic radiographs with Leptospirosis?
Nodular opacities
What do you see on Abdominal Ultrasound with Leptospirosis?
kidneys enlarged medullary band of increased echogenicity pyelectasia increassed cortical echogenicity mild perianal fluid accumulation
What do you find on hematology for Leptospirosis?
decrease in platelets and neutrophils, and RBCs
Hepatic/renal disease
What do you find on Urinanalysis for Leptospirosis?
proteinuria glucosuria bilirubinuria pyuria hematuria granular casts
Pyelectasia
Enlargement of the pelvis of the kidney
What is the treatment for Leptospirosis?
Supportive Care: Urinary catheter Replacement fluids Anti emetics gastric protectants Plasma/ Fresh whole blood Diuresis for acute renal failure Doxycycline Penicillin G Ampicillin
Clostridium botulinum
Gram positive
Straight or slightly curved motile anaerobic rods
What causes botulism?
ingestion of a preformed toxin
What does botulinal toxin cause?
LMN disease/paralysis
What is the mechanism of action of Clostridium botulinum?
Prevent presynaptic release of acetylcholine at the neuromuscular junction
What are the clinical signs of Clostridium botulinum?
Weakness Flaccid paralysis Autonomic dysfunction Progressive symmetrical ascending paralysis Mydriasis decreased gag reflex excess salivation diminished palpebral reflexes weak vocalisation Constipation Urinary retention
What is the incubation period of Clostridium botulinum?
hours to 6 days
How do you diagnose Clostridium botulinum?
EMG (electromyography)
toxin in serum, feces, vomitus, or stomach contents
How do you treat Clostridium Botulinum?
Supportive care
Metronidazole
Penicillins
How do you prevent clostridium botulinum?
Heat food
vaccination against toxins
Clostridium tetani
Gram positive
motile
anaerobic spore producing bacterium
What are the two toxins of clostridium tetani?
Tetanoleptin
Tetanospasmin
Tetanoleptin
causes hemolysis of erythrocytes
Tetanospasmin
causes neurological dysfunction but inhibiting the motor neurons
How does clostridium tetani toxin work?
the toxin migrates up the motor nerves, and can enter the spinal cord and ascends into the brain. It also affects the cranial nerves.
The toxin inhibits the release of 1. glycine and 2. gamma-aminobutyric acid
What are the clinical signs of clostridium tetani?
Ear drawn back Sardonic grin Trismus (lock jaw) Salivation Dysphagia Gait - ambulatory but rigid Progresses to opisthotonus, convulsions, and respiratory compromise leading to death
What are the clinical findings associated with clostridium tetani?
Leukocytosis LS neutrophilia Tachyarrhthmia Bradyarrhythmia Megaoesophagus
What is the treatment for clostridium tetani?
Supportive care Antitoxin IM Antibiotics - Metranidazole, Penicillin G, and tetracyclin Sedatives Muscle relaxants Autonomic agents Surgery and wound management Nursing care
What tick transmits Mycoplasma haemocanis?
Brown tick - Rhipicephalus sanguineus
How do you diagnose Mycoplasma haemocanis?
PCR
organism on blood smear
How do you treat Mycoplasma haemocanis?
Doxycycline
What is required before clinical signs develop for Mycoplasma haemocanis?
Splenectomy
How is Canine Bartonella transmitted?
Dog bites
fleas
cat scratches
How do you diagnose Canine Bartonella?
Serology
Bacterial Isolation - PCR
What is the treatment for Canine Bartonella?
Doxycycline
Enrofloxacin
Azithromycin
rifampin
Rocky Mountain spotted fever
Rickettsia rickettsia
Monocytotrophic ehrlichiosis
Ehrlichia canis
E. chaffeensis
Granulocytotrophic ehrlichiosis
E. ewingii
Granulocytotrophic anaplasmosis
Anaplasma phagocytophilum
Thrombocytotropic anaplasmosis
A. platys
Salmon poisoning
Neorickettsia helminthoeca
What is the pathophysiology for Rickettsia?
Rickettsiae enter the blood, replicate in the endothelial cells leading to result in vascular damage and increased vascular permeability and leakage of fluid
What are the clinical signs of Rickettsia?
Petechiation bleeding internally and externally lameness thrombocytopenia hypoalbuminemia
What is the vector for E. canis and E. chaffeensis?
Rhicephalus spp. Amblyomma americanum
What cells do E. canis and E. chaffeensis infect?
Mononuclear cells in phagocytic tissues
What cells do A. equi or A. ewingii infect?
neutrophils
What is the vector for A. phagocytophilum?
Ixodes spp.
What are the clinical signs of A. equi and A. ewingii?
Lameness
Fever
Joint swelling
pain
What is the vector for A. platys?
Rhicephalus and Dermacentor spp.
What cells do A. platys infect?
Platelets
What is the vector for Rocky Mountain Spotted Fever?
Dermacenter variabilis
How do you diagnose Rickettsial disease?
Blood smear/cytology
Serology
PCR
What are the Clinical findings for Rickettsial disease?
Hematology: Thrombocytopenia Neutropenia lymphocytosis Anemia Hypoalbuminemia hyperglobulinemia Proteinuria
What are the CV signs of Rickettsia?
AV blocks
tachycardia
arrhythmias
What are the CNS signs of Rickettsia?
vestibular
cerebellar signs
coma
paralysis
What are the Ocular signs of Rickettsia?
Hemorrhage
What are the Renal signs of Rickettsia?
Azotemia
What are the Pulmonary signs of Rickettsia?
edema
What are the GI signs of Rickettsia?
vomiting
diarrhea
melena
What are the Integument signs of Rickettsia?
petechial bleeds
What is the treatment for Rickettsia?
Doxycycline
What is the prevention for Rickettsia?
Tick control
How is Neorickettsia helminthoeca transmitted?
ingestion of fish with a fluke containing rickettsia
Where do you find Neorickettsia?
WA
OR
CA
What are the clinical signs of Neorickettsia helminthoeca?
Fever serous to purulent ocular discharge lymphadenopathy splenomegaly periorbital edema vomiting diarrhea
How do you diagnose Neorickettsia helminthoeca?
Fluke eggs in feces
FNA of lymph nodes with rickettsial inclusions
How do you treat Neorickettsia helminthoeca?
Supportive care
Tetracycline/doxycycline
What is the pathogenesis of Canine Distemper Virus?
Water droplets ender the upper respiratory tract epithelium and multiplies in the tissue macrophages which spreads to local lymphatics in tonsils and bronchial lymph nodes.
After 4-6 days virus multiplication occurs in the lymphoid follicles of the spleen and gut associated lymphatic tissue of the lamina propria of the stomach and small intestine, mesenteric lymph nodes and Kupfer cells in the liver
Humoral immune system
antibodies produced by B-lymphocytes
Cell mediated immune system
mediated by T lymphocytes
Where does Canine Distemper Virus spread to?
skin exocrine and endocrine glands epithelium of the GI tract Respiratory tract Genitourinary tract
What are the clinical signs of Canine Distemper Virus?
Listlessness Bilateral serous oculonasal discharge Biphasic pyrexia Keratoconjunctivitis sicca Diarrhea Vesicles and pustules of the skin Nasal and digital hyperkeratosis Respiratory Signs: Tachypnea Neurological signs: Seizures, meningeal inflammation, Myoclonus
How do you diagnose Canine Distemper Virus?
Intracytoplasmic inclusion bodies in RBCs
MRI
Serology
CSF tap: Anti-CDV antibody, increase in protein count
PCR
Serum ANTIBODY testing
What is the gold standard test for Canine Distemper Virus?
Neutralising antibodies
What is the treatment for Canine Distemper Virus?
Supportive- antibiotics and steroids to reduce CNS edema
Seizure medication
What is the prognosis for Canine Distemper Virus?
Poor
How do you prevent Canine Distemper Virus?
Vaccination
What are the different types of Vaccination of Canine Distemper Virus?
Non-living antigen vaccine
Vector vaccine
Modified live vaccine
What is the most common vaccine used for Canine Distemper Virus?
Modified live vaccine
What vaccine protects naive pups from Canine Distemper Virus?
Vector vaccine
What vaccine causes adverse reactions?
Canine Distemper Virus vaccine
How often do you have to vaccinate for Canine Distemper Virus?
every 3 years
What virus is highly resistant to the environment in dogs?
Canine Adenovirus-type 1
What cleaning methods are effective for Canine Adenovirus-type 1?
steam cleaning
iodine
phenol
sodium hydroxide
Where is Canine Adenovirus-type 1 found on day 10-14?
Kidneys
What is the pathogenesis of Canine Adenovirus-type 1?
Oronasal exposure and multiplication in tonsils spreading to the lymphnodes and lymphatics leading to severe viremia spreading to Hepatic parenchyma cells, vascular endothelium and CNS
What are the clinical signs of Canine Adenovirus-type 1?
Pyrexia tachycardia tonsillar enlargment lymphadenopathy hemorrhagic diathesis Corneal edema anterior uveitis