Listeria spp. Flashcards
what is the more pathogenic and zoonotic spp of listeria
L. monocytogenes
what spp of listeria is known to cause abortion in sheep
L. ivanovii
True or False:
listeria is a contagious disease
FALSE
what are the forms of listeria
septicemia
abortion
CNS
mastitis
what are the characteristics of a listeria bacteria
gram +
rod
non-spore forming
food bourne pathogen
why is listeria hard to contain / destroy
grows 3-45 C
how can one describe the motility of L. monocytogenes
tumbling motility
within a cow, how can listeria be excreted
bovine milk
what human foods are listeria associated with
cheese
milk
poultry meat
what is the mode of infection of listeria monocytogenes
ingestion
silage pH >5
what are the virulence factors of L. monocytogenes
Internalin
listeriolysin O
glyceride factor
if L. monocytogenes enters the body through the oral route, what is the likely outcome
circling disease by infection of the trigeminal nerve
in L. monocytogenes enter the body through the intestinal mucosa, what is the outcome
abortion
stillbirth
if L. monocytogenes enter the body via blood, what is the outcome
meningitis
what nerve is often infected with L. monocytogenes
trigeminal nerve
what is commonly seen in the CNS form of L. monocytogenes
meningoencephalitis (adults)
meningitis (preruminanting calves)
when is CNS form of L. monocytogenes commonly seen
winter and early spring due to bad silage
what are the clinical signs of CNS form of L. monocytogenes
depression
drooping ears
head tilt
protrusion of tongue
paralysis of face
what is often the outcome of CNS L. monocytogenes
death in 2 to 3 days
how does the bacteria of the CNS L. monocytogenes travel through the body
through nerves (trigeminal nerve)
what clinical signs are often seen in the abortion form of L. monocytogenes
placentitis
late term abortion
what are the clinical signs of septicemic form of L. monocytogenes
depression
dyspnea
salivation
nasal discharge
lacrimation
where are lesions commonly found in septicemic infections of L. monocytogenes
liver
spleen
lymph nodes
what secondary issues are often seen with septicemic L. monocytogenes
enteritis
myocardial necrosis
what type of infection is created with the mastitis form of L. monocytogenes
suppurative infection
what species often sees an increase of septicemic form of L. monocytogenes
horses
what species more commonly sees encephalitis in occurance with L. monocytogenes
chickens
what type of lesions are often seen and help with diagnosis L. monocytogenes
perivascular cuffing
