Infectious Diseases of Ruminant & Swine Flashcards
Etiology of Bovine Respiratory Disease Complex (BRD)
IBR: Infectious Bovine Rhinotracheitis: Bovine Herpes Virus 1
BVDV: Bovine viral diarrhea virus
PI3: Parainfluenza-3 virus
BRSV: Bovine respiratory syncytial virus
BRD develops as a result of
Complex interactions between environmental factors, host factors, and pathogens
Secondary infections of BRD
Pasteurella multocida
Mannheimia haemolytica
Histophilus omni
Mycoplasma Boris
BRD often leads to
Bacterial pneumonia, shipping fever pneumonia, enzootic pneumonia in calves
Diagnosis of BRD
Clinical signs, hx, serology, virus isolation
Treatment of BRD focuses on
Antimicrobial therapy to control secondary bacterial pneumonia
Vaccine of BRD
IBR-BVD-PI3-BRSV
PI animals are produced when
a fetus is infected while partially immunocompetent thus recognizing viral cells as self and not mounting an immune response
The goal of vaccination for BVDV is
is to minimize respiratory disease secondary to BVD exposure and to prevent the occurrence of PI animals
Clostridia are
relatively large, anaerobic, spore-forming, rod-shaped, gram positive bacterial organisms
Etiology of Clostridial disease:Tetanus
Clostridium tetani
Clinical signs of Tetanus
localized stiffness, often involving the masseter muscles and muscles of the neck, hindlimbs, and region of the infected wound
Diagnosis of Tetanus
Hx,clinical signs, presence of toxin in serum
Clostridial disease: Malignant edema is
an acute generally fatal toxemia affecting all species and ages of animals
Etiology of Malignant edema
Clostridium septicum
Clinical signs of Malignant edema
-local lesions are soft swellings that pit on pressure; the muscles turns dark brown to black
-Accumulation of gas in SQ tissue and along muscles fascias may be present
-Extensive local sloughing of skin and tissues is often seen in progressed states of malignant edema
Etiology of Clostridial Disease:Blackleg
Clostridium chauvoei
Blackleg disease
acute febrile highly fatal disease of cattle and sheep
blackleg is characterized by
emphysematous swelling, commonly affecting heavy muscles (clostridial myositis)
C. chauvoei is found naturally in
the intestinal tract of animals
Clinical signs of Blackleg
onset is sudden, and a few cattle may be found dead without premonitory signs. acute severe lameness and marked depression are common
Vaccine for blackleg
7-way or Blackleg vaccine
Leptospiral servers of major importance in cattle are
Hardjo and pomona
Clinical signs of Leptospirosis
Reproductive loss through abortion and stillbirth of premature and weak infected calves
Vaccination for leptospirosis
Two doses in calf-hood then every 3-12 months in adult-hood
Vibriosis
a venereal disease of cattle caused by a bacterial infection with Campylobacter fetus subspecies venerealis
Vibriosis is spread at
joining either from an infected bull to an uninfected cow or vice versa
Initial indication of Vibriosis
cows returning to service and low pregnancy rates
Transmission of Diarrhea in calves
With all enter-pathogens, healthy adult cattle may be carriers and periodically excrete the organism in feces. Excretion may increase around parturition
Etiology of Mastitis
Bacterial: staphylococcus aureus, streptococcus agalactiae, corynebacterium ovis, mycoplasma spp, escherichia
Prevention of mastitis
Husbandry
etiology of brucellosis
brucella abortus
Clinical signs of Brucellosis
abortion, stillborn, or weak calves, retained placentas, reduced milk yield
Tests for Brucellosis
Brucella milk ring test (MRT), Rose Bengal Plate test
All states are considered free of
Brucellosis
Identification of Brucellosis Vaccinate
Tattoo in right ear
Etiology of infectious keratoconjunctivitis (pinkeye)
Moraxella bovis
Enterotoxemia caused by
Clostridium perfringens types B and C
Infection with C perfringens types B and C causes
Sever enteritis, dysentery, toxemia, high mortality
Typer D enterotoxemia aka
Pulp kidney disease, overeating disease
Etiology of Type D Enterotoxemia
C perfringens type D
Contagious Ecthyma (orf)
infectious dermatitis of sheep and goats that affects primarily the lips of young animals but can occasionally affect people through direct contact.
Clinical Signs of Ecthyma
lesions develop at mucocutaneous junction of lips and around erupting incisor teeth, may extend to mucosa of buccal cavity
All ruminants are susceptible to __ disease
Johne’s
Etiology of John’s Disease
Mycobacterium paratuberculosis
How does Johne’s disease progress
Slowly
clinical signs of Johne’s disease
weight loss, chronic progressive diarrhea, dependent edema, emaciation, death
Erysipelas is a
Significant bacterial and zoonotic pathogen of swine, turkeys, and sheep.
Etiology of erysipelas
Erysipelothrix rhusiopathiae
Acute outbreaks of swine erysipelas are characterized by
acute outbreaks of sudden and unexpected deaths, febrile episodes, painful joints, skin lesion, cyanosis, diamond skin
Swine Dysentery
a mucohemorrhagic diarrheal disease of pigs that affects the large intestine
Etiology of Swine Dysentery
Brachyspira hyodysenteriae
Transmissible Gastroenteritis in Pigs (TGE)
a common viral disease of the small intestine that causes vomiting and profuse diarrhea in pigs of all age
Etiology of TGE
Coronavirus