Interesting Case Rounds
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Transcript of Interesting Case Rounds
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Interesting Case Rounds
Shawn Dowling
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Case• 35M. Engineer.
Presents to emerg (MT area)
• Concerned that he has Listeriosis and that he’ll die
• Are you going t work this individual up? Counsel him?
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In case anyone lives in a cave…
• July; routine surveillance noted an Listeriosis– Outbreak traced to Maple Lead factory in ON– 29 confirmed cases, 31 Suspected cases– 5 deaths confirmed to be from outbreak, 10 under
investigation– AB - Cases for 2008
• Listeriosis cases as of August 26 • 9 Cases/7 under investigation for link to outbreak – Results pending = 5 (including 2 deaths)– Results confirmed = 2 not linked outbreak
• Cases linked to national outbreak = 0
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Objectives• Discuss Listeria monocytogenes in terms of
– Microbiology– Pathophysiology– At risk populations– Clinical Presentations– Investigations– Management– Prevention
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Microbiology of Listeria monocytogenes
• Only Listeria species that infects humans
• Gram +ve rod, aerobic/facultative anaerobic
• May resemble pneumococcus, diphtheria or haemophilus on gram stain
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Pathogenesis• Facultative intracellular parasite• Usu in soil and decaying vegetable matter• Infection usu from oral ingestion->
mucosal penetration->systemic infection• Immunity to Listeria primarily occurs via T-
cell activation of macrophages• Listeria has a predilection for CNS and
placental tissue
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Epidemiology• Baseline incidence 1.55/100,000 (likely
under-estimated) Canada wide, in AB 1/100,000
• Sporadic illness• Outbreaks• <1% of FB illnesses but second highest
mortality rate amongst foodborne illnesses (1st is Vibrio vulnificus), accts for 28% of all f.b. deaths
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What is an outbreak?• Increase in incidence beyond the
expected in a defined geographic area, within a defined period of time
• A statistically significant increase in the rate of adverse events above that noted in the past
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Steps to Outbreak Investigation
• Verify diagnosis• Confirm outbreak• Identify and count cases• Develop epidemic curve• Take immediate control measures• Formulate and test hypotheses• Communicate findings• Implement interventions
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QuickTime™ and a decompressor
are needed to see this picture.
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Listeria Outbreaks• Have been associated with a number of
foods: MC are deli meats, soft cheeses(unpasteurized), smoked seafood, meat spreads and paté’s
• Attack rate ranges from 50-100%• Incubation period
– Mean = 3 wks, (range 3 to 90 days)
• Reportable disease - call the MOH
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Predisposing Conditions• Most systemic listerial infections occur in
individuals with one or more predisposing conditions– Pregnancy (esp 3rd trimester)– Immunocompromised state (i.e. steroid Tx,
malignancy - esp lymphoma, ESRD, HIV, etc.)– Age: neonates and Elderly (>65 yoa)
• (1995) Listeria was causative agent for bacterial meningitis - 22% in elderly, 23% in neonates, 4% in those b/w 2-60
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Case Definition • Confirmed Case • Symptomatic individuals[1] with laboratory
confirmation of infection: • Isolation of Listeria monocytogenes from a normally
sterile site (e.g., blood or cerebrospinal fluid [CSF] or, less commonly, joint, pleural, or pericardial fluid)
OR • In the setting of miscarriage or stillbirth, isolation of L.
monocytogenes from placental or fetal tissue (including amniotic fluid and meconium)
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Clinical Manifestations• Febrile gastroenteritis• Focal Infections• Infection in pregnancy• Sepsis• CNS infections
– Meningoencephalitis– Cerebritis– Rhomboencephalitis
• Mild
• Severe
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Pt Assessment• Detailed food Hx
– List of detailed recalled products– http://www.inspection.gc.ca/english/corpaff
r/recarapp/2008/list97be.shtml– Recommend food cultures - ? necessary in
times of an outbreak - speak to MOH
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Febrile Gastroenteritis• Usu occurs after ingestion of large inoculum,
can occur in normal hosts• Sx: fever, watery diarrhea, N,V, HA,
myalgias/arthralgias• Sx typically last 2 days• Usu self-limited, can progress to one of the
other presentations if at-risk populations• Do not do stool cultures• Tx if: 1) persistent Sx, 2)high risk patients,
3)ingested food implicated in outbreak
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Infection in Pregnancy• Usu in 3rd trimester• Sx: fever, chills,
back pain - nonspecific
• LOW Threshold to get b.c. in febrile preg patient w/o source(esp when an outbreak of listeria)
• Consequences– Study of 11 pregnant
pts; 2 fetal demises, 6 of 9 neonates had listerial infection, 3 not infected
• Granulomatosis infantiseptica: – Disseminated
abscess/granulomas
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Tx in Pregnant • Supportive Tx• Any pregnant patient with documented
listeria infection should be treated:– Ampicillin IV 2 g Q4H– If allergic
• TMP/SMX IV (do not use during 1st trimester or last month of pregnancy) - 5mg/kg of TMP
• Alt: vancomycin if PCN allergic and CNS infection
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CNS Infection• Range of clinical presentation - fever +
AMS to fulminant course + coma
• Can present like classic meningitis or with focal CNS signs, ataxia, tremor, seizures
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• Can also present like a cerebritis– Fever, HA, hemiplegia (resembling a
stroke)
• Can present like a rhomboencephalitis– Biphasic course of HA, fever, N/V followed
by CN palsies, ataxia, tremor, decreased LOC, sz and hemiparesis
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CNS Investigations• CT if focal neuro signs, papilledema or AMS• LP
– One of the nonTB causes of high lymphocyte counts (>25%)
– Protein up– Glucose down (39%)– Gram stain - low sensitivity, low specificity
• May need MRI - better than CT for cerebellar or brainstem lesions
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Tx with CNS infection• Ampicillin is drug of choice
– Will likely be covering for other agents– Ceftriaxone does not cover Listeria– May consider adding synergistic gent
dosing (1mg/kg Q8H) in CNS infection & sepsis
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Prevention Measures• Thoroughly cook/heat
raw food from animal sources– Beef, pork & poultry
• Additional recommendations for persons at high risk : – avoiding unpasteurized
cheeses. There is no need to avoid pasteurized cheeses, cream cheese, cottage cheese or yogurt),
– reheating leftovers of ready-to-eat foods such as hot dogs should be steaming hot before eating, and
– avoiding foods or thoroughly reheat cold cuts before eating from delicatessen counters especially pregnant women and immuno-suppressed persons although the risk is relatively low
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Recommendations for patients with known exposure
• ASx patients - reassure, discuss Sx• Sx patients + exposure
– Febrile gastro + high risk; early blood cultures
– Pregnant patient; Tx if Listeria +ve– CNS infection/sepsis - Tx as normal,
consider adding Ampicillin (Vanco of PCN allergic) coverage +/- gent (synergistic dosing) in HIGH RISK patients
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More Sites• Health Canada
– http://www.hc-sc.gc.ca/hl-vs/iyh-vsv/food-aliment/listeria-eng.php
• AB Health and Wellness– http://www.health.alberta.ca/