agents of bioterrorism - agdefense.comagdefense.com/reference files/agentsof bioterrorism.pdf ·...
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Agents of BioterrorismAgents of Bioterrorism
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ObjectivesObjectives
Apply appropriate biosafety practices when working with potentially dangerous organisms
Recognize agents that could be used for bioterrrorism and perform selected tests to rule them out
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ObjectivesObjectives
Refer potentially dangerous specimens or organisms to an appropriate lab for confirmation
Develop an Emergency Preparedness Plan for your laboratory.
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Level A Laboratory:Level A Laboratory:DefinitionDefinition
BSL-2 Laboratory with a certified Class II biological safety cabinet– BSL-1 microbiology practices plus– Directed by competent scientists– Personnel specifically trained in handling
pathogenic agents
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Level A Laboratory:Level A Laboratory:DefinitionDefinition
BSL-2 Laboratory with a certified Class II biological safety cabinet– Physical containment practices to minimize
infectious aerosols– PPE
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Role of the Level A Role of the Level A LaboratoryLaboratory
Rule out critical biological agents
Refer to higher level laboratory
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Bioterrorism Agents:Bioterrorism Agents:Laboratory RiskLaboratory Risk
Agent BSL Laboratory RiskB. anthracis 2 lowY. pestis 2 mediumBrucella spp. 2/3 highF. tularensis 2/3 highBotulinum toxin 2 mediumSmallpox 4 highViral Hemorrhagic fever 4 high
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Francisella tularensisFrancisella tularensisTularemia
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Francisella tularensisFrancisella tularensis“A Rose by Any Other Name”“A Rose by Any Other Name”
Plague-like disease in rodents (California)Deer-fly fever (Utah)Glandular tick fever (Idaho and Montana)Market men’s disease (Washington, DC)Rabbit fever (Central States)O’Hara’s disease (Japan)
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Reported Cases of Tularemia Reported Cases of Tularemia --19901990--19981998
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TularemiaTularemiaContagious --- noInfective dose --- 10-50 organismsIncubation period --- 1-21 days (average=3-5 days)Duration of illness --- ~2 weeksMortality --- treated : low
untreated: moderatePersistence of organism ---months in moist soilVaccine efficacy --- good, ~80%
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Level A Procedures Level A Procedures Francisella tularensisFrancisella tularensis
This is a dangerous, highly virulent organism and it should not be manipulated at the bench.Gram stainGrowth characteristics in brothGrowth characteristics in agar
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Francisella tularensisFrancisella tularensis
Gram stain– Poorly staining,
tiny Gram-negativecoccobacilli
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Francisella tularensisFrancisella tularensisGrowth CharacteristicsGrowth Characteristics
Fastidious, requires cysteine for robust growth: Cysteine Heart Agar (CHA) is ideal– Enriched chocolate agar : 9% sheep blood +
cysteine– Not part of Level A routine procedures
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Francisella tularensisFrancisella tularensisGrowth CharacteristicsGrowth Characteristics
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Gram Negative CoccobacilliGram Negative Coccobacilli
Most likely– Acinetobacter– Actinobacillus– H. aphrophilus– Bordetella spp. – Pasturella spp.
Least likely– DF-3– Brucella spp.– Francisella spp.
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Francisella tularensisFrancisella tularensisTechnical HintsTechnical Hints
If you see:– Tiny, gram-negative coccobacilli from blood, lymph
node aspirate, or respiratory specimens– Blood isolates that grow slowly on chocolate agar
but poorly on blood agar – Robust growth in BCYE; requires cysteine
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Yersinia pestisYersinia pestisPlague
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Plague EpidemiologyPlague Epidemiology
U.S. averages 13 cases/yr (10 in 1998)30% of cases are in Native Americans in the Southwest. 15% case fatality rateMost cases occur in summer
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Plague EpidemiologyPlague Epidemiology
Three Clinical Types:– bubonic (infected lymph nodes)– septicemic (blood-borne organisms)– pneumonic (transmissible by aerosol;
deadliest)
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Yersinia pestisYersinia pestisSpecimen SelectionSpecimen Selection
Specimen selection is important– Bubonic - bubo - lymph node aspirate– Septicemic - blood - Obtain three sets
10-30 minutes apart– Pneumonic
• Sputum/throat• Bronchial washings
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Yersinia pestisYersinia pestisSpecimen inoculationSpecimen inoculation
Inoculate routine plating media and make thin smear for DFA
• Use Wayson only if DFA is unavailable
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Level A ProceduresLevel A ProceduresYersinia pestisYersinia pestis
Gram stain
Wayson stain
Growth characteristics on agar
Growth characteristics in broth
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Yersinia pestisYersinia pestisGram stainGram stain
Must confirm by DFA and mouse inoculation
Small, gram-negative bipolar-stained coccobacilli
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Yersinia pestisYersinia pestisWayson StainWayson Stain
Wayson stain alone is not diagnostic
Pink-blue cells with a closed safety pin look
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Yersinia pestisYersinia pestis in BHI Brothin BHI Broth
Y. pestis Y. pseudotuberculosis
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Yersinia pestisYersinia pestisTechnical HintsTechnical Hints
Small gram-negative, poorly staining rods from blood, lymph node aspirate, or respiratory specimens
Safety pin appearance in Gram, Wright, Giemsa, or Wayson stain
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Yersinia pestisYersinia pestisblood plateblood plate
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Variola virusVariola virusSmallpox
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VariolaVariolaSmallpox virusSmallpox virus
Large DNA virusDumbbell-shaped coreComplex membranes
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Level A ProceduresLevel A ProceduresSmallpox virusSmallpox virus
Rule out chickenpox (PCR)! Specimen of choice is lesion material from pustulesContact your State Public Health Laboratory for guidance
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Ebola Marburg
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Families Responsible for VHF:– Arenaviridae– Bunyaviridae– Filoviridae– Flaviviridae
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Arenaviruses– Argentine Hemorrhagic Fever– Bolivian Hemorrhagic Fever– Sabia Associated Hemorrhagic Fever– Lassa Fever
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Bunyaviruses– Crimean-Congo Hemorrhagic Fever– Rift Valley Fever– Hantavirus Pulmonary Syndrome
Hemorrhagic Fever
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Filoviruses– Ebola Hemorrhagic Fever– Marburg Hemorrhagic Fever
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Hemorrhagic Fever VirusesHemorrhagic Fever Viruses
Flaviviruses– Tick-borne Encephalitis– Kyasanur Forest Disease– Omsk Hemorrhagic Fever
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Viral Hemorrhagic FeversViral Hemorrhagic Fevers
Contagious --- ModerateInfective dose --- 1-10 particlesIncubation period --- 4-21 daysDuration of illness --- 7-16 daysMortality ---variablePersistence of organism --- unstableNon-endemic in U.S.No vaccine
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VHF SpecimensVHF Specimens
Diagnosis is clinical, not laboratoryNo specimen accepted without prior consultation
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Handling VHF SpecimensHandling VHF Specimens
Sample for serology - 10-12 ml– ship on dry ice
Tissue for immunohistochemistry– formalin-fixed or paraffin block– ship at room temperature
Tissue for PCR/virus isolation– ante-mortem, post-mortem; ship on dry ice
ship serum cold or on dry ice in a plastic tube
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BrucellaBrucella sppspp..Brucellosis
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BRUCELLOSISBRUCELLOSIS
Zoonotic disease caused by any of 4Brucella spp.: abortus, melitensis, suis, and canis
Systemic infection characterized by an undulant fever pattern
Relatively rare in the U.S. with approximately 100 cases/year
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BrucellosisBrucellosis(by year, United States, 1966(by year, United States, 1966--1996)1996)
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BRUCELLOSIS: HISTORYBRUCELLOSIS: HISTORY
1887 Bruce - Malta fever, M. melitensis1897 Bang - cattle abortion, B. abortus1914 Traum - sow, B. suis1920 Evans, Meyer, Shaw - Brucella1954 B. suis, first weaponized U.S. agent1968 Carmichael - Beagles, B. canis
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BRUCELLOSIS:BRUCELLOSIS:TRANSMISSIONTRANSMISSION
Ingestion– The most common mode of transmission
Direct skin contact/puncture– Occupational hazard for farmers,
butchers and veterinariansAerosols– Highly infectious
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BRUCELLOSISBRUCELLOSIS
Infective dose = 10 -100 organismsIncubation period = 5 days - > 6 monthsDuration of illness = weeks to monthsFever, profuse sweating, malaise, headache and muscle/back pain No person to person transmissionMortality: < 5%Stable organisms
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BrucellaBrucella sppspp. . Specimen SelectionSpecimen Selection
SerumBlood or bone marrowTissue (spleen, liver)
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Level A Laboratory TestsLevel A Laboratory TestsBrucellaBrucella sppspp..
Colonial morphology on SBAGram stain morphologyOxidaseUrea hydrolysis
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B. B. abortusabortus, gram stain, gram stain(x3200)(x3200)
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BrucellaBrucella sppspp..Key Level A Lab TestsKey Level A Lab Tests
Colonial morphology on SBA– Fastidious– Visible growth may take 48 - 72 hrs– Small (0.5-1.0mm), convex, glistening– Non-hemolytic and non-pigmented
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BrucellaBrucella sppspp..Key Level A Lab TestsKey Level A Lab Tests
Oxidase-positive– B. melitensis (100%)– B. abortus (96%)– B. suis (95%) – B. canis (72%)
Urea hydrolysis-positive– B. suis & B. canis ~15 min– B. abortus & B. melitensis ~24hr
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BrucellaBrucella sppspp..Other Ox+/Ur+ GN OxidizersOther Ox+/Ur+ GN Oxidizers
Achromobacter grp BAcidovorax sppAgrobacterium sppEO-2/EO-3Flavobacterium sppMethylobacterium spp
OchrobactrumPseudomonas sppRiemerellaRoseomonas sppO-2II-i
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BrucellaBrucella sppspp..Technical HintsTechnical Hints
Misidentified as Moraxella sp.– Clin Inf Dis 1993; 17:1068-9
Reported as gram-positive cocci, mistaken for “slow-growing” Staphylococcus sp.
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BrucellaBrucella sppspp..Review of Key TestsReview of Key Tests
Tiny, faintly staining, gram-negativecoccobacilli from blood or bone marrowOxidase +Urease +
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Clostridium botulinumClostridium botulinumBotulism
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BOTULISMBOTULISM
Diagnosis of botulism is made clinicallyHealth care providers suspecting botulism should contact their State Health Department
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Laboratory Capacity for Laboratory Capacity for Botulinum Toxin TestingBotulinum Toxin Testing
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FOODBORNE BOTULISMFOODBORNE BOTULISMInfective dose: 0.001 µg/kgIncubation period: 18 - 36 hoursDry mouth, double vision, droopy eyelids, dilated pupilsProgressive descending bilateral muscle weakness & paralysisRespiratory failure and deathMortality 5-10%, up to 25%
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FOODBORNE BOTULISMFOODBORNE BOTULISMAmong 309 persons with clinically diagnosed botulism reported to CDC from 1975 to 1988:– Stool cultures for C. botulinum: 51% +– Serum botulinum toxin testing: 37% +– Stool botulinum toxin testing: 23% +
Overall, at least one of the above tests was positive for 65% of all patients
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Level A ProceduresLevel A Proceduresfor Botulism Eventfor Botulism Event
Properly collected specimens are to be referred to designated testing laboratories
Prior to the shipment of any botulism-associated specimen, the designated laboratory must be notified and approved by the State Health Department
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Level A ProceduresLevel A Proceduresfor Botulism Eventfor Botulism Event
Clinical specimens to be collected:1. Serum2. Gastric contents or vomitus3. Feces or return from sterile water enema4. Wound tissue
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Botulism Biosafety AlertBotulism Biosafety AlertBotulism toxins are extremely poisonous
Minute quantities acquired by ingestion, inhalation, or by absorption can cause death
All materials suspected of containing toxin must be handled with CAUTION!
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Bacillus anthracisBacillus anthracisAnthrax
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ANTHRAXANTHRAX
Three forms of human anthrax occur:1. Cutaneous2. Gastrointestinal3. Inhalational
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Cutaneous anthraxCutaneous anthrax
Vesicle development, day 2 Eschar formation, day 4
www.who.www.who.intint//emcemc//
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Anthrax Lesion on NeckAnthrax Lesion on Neck
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Inhalational AnthraxInhalational Anthrax
Infective dose = 8,000 - 15,000 sporesIncubation period = 1-6 daysDuration of illness = 3-5 daysFever, malaise, and fatigueShort period of improvement = up to 2 daysAbrupt respiratory distress…death <24hrsNo person to person transmission
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Inhalational AnthraxInhalational Anthrax
Infection of tissueLate in the course of infectionChest X-ray
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Mediastinal LN, microcolonies ofMediastinal LN, microcolonies ofB anthracis, B anthracis, Giemsa stainGiemsa stain
www.www.philphil.cdc.gov/.cdc.gov/
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Anthrax: Specimen SelectionAnthrax: Specimen Selection
Inhalation: Sputum and Blood
Cutaneous: Vesicles and Eschar
Gastrointestinal: Stool and Blood
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Bacillus anthracisBacillus anthracisKey Level A Lab TestsKey Level A Lab Tests
Gram stainGrowth characteristics on agarSporulation, in airLack of motilityPenicillin inhibition zoneCapsule formation
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B. anthracisB. anthracisColony on SBAColony on SBA
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75 B. anthracis on blood (left) and bicarbonate agar (right) plate (demonstrating capsule formation)
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“STICKY” consistency of “STICKY” consistency of B. anthracis’B. anthracis’ colony on SBAcolony on SBA
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B. anthracis, B. anthracis, Gram stainGram staindemonstrating sporesdemonstrating spores
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Bacillus anthracisBacillus anthracisPresumptive IdentificationPresumptive Identification
Gram-positive rod
catalase-positive
Aerobic spore formation
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Bacillus anthracis Bacillus anthracis Presumptive IdentificationPresumptive Identification
Spores are ovalnon-swelling of vegetative cellground glass colony morphology– B. anthracis (non-motile)– B. cereus – B cereus var mycoides (non-motile)– B. thuringiensis
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Bacillus anthracisBacillus anthracisPresumptive IdentificationPresumptive Identification
Nonmotile: B anthracis and B cereus var mycoides (and B. megaterium)
Nonhemolytic, penicillin inhibition zone (15-20 mm) Capsule formation
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CDC Laboratory PearlCDC Laboratory Pearl
The most common Bacillus sp. submitted to CDC to r/o B. anthracis are non-motile B. megaterium
A non-motile, Bacillus sp, is recovered from a blood culture. What is one of the fastest procedures to r/o anthrax ?
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AcknowledgementsAcknowledgements
Dr. Robbin WeyantDr. Susan MaslankaDr. May ChuDr. Tom KsiazekDr. Peter TurnbullDr. Edward Ewing