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Cas Study of NoV: Key facts

During summer 0f 2009, a cruiseship having 1,5000 passengers and60 crews travelled for for 14 days

The cruised stopped 7 days shortand subitted 675 passengers and

50 crews with NoV infection

Most victims ate:

steak (rare, medium, well-done)

Baked potato

fresh salad

2 cooks were positive for NoVupon boarding


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Page 3

Questions:

1

Thelikeliness of Nov to be present in the 3 types of food

mentioned (steaks, salad, baked potato)

2

Handling and processing steps of the above food that maycontribute to the survival of the virus in the products

3 Incubation time and sypmptoms of NoV infection

4 The scenario on how the outbreak may have occurred

5

How do you prove that the worker were indeed the sourceof the viruses?


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ClassificationGroup : IV ((+)ssRNA (single stranded RNA)Family : CaliciviridaeGenus : Norovirus

Other names:-Norwalk virus, Norwalk-like virus, Norovirus(2002)1st outbreak: 1968 di Norwalk, Ohio, USA

Morphologiy:Shape : small, round structural viruses (SRSVs)Primary compound: proteinWeight = 58-60 k DA

Length = 27-38 nmIt doesnt have envelope


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Norovirus classification by Genogroup

GI, GII, GIV : HumanGI: Norwalk V, Southampton V, desert shield V

GII: Hawaii V, snow mountain V, Toronto V,Bristol V, hunter V, Grimsby virus

GIV: Alphatron)

GIII : bovine, pig (Jena virus)

GV : miceOutbreak on human : GI & GII


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Transmission person-to-person:

fecal-oral route ingestion of aerosolized vomitus

indirect exposure via fomites contaminated environmental surfaces

foodborne infected food handlers during preparation further upstream in the food distribution system

Waterborne

Shedding: fecal (104 106/gram) and vomit Infection dose: 10-100 viruses

NoV still could be detected on fecal 4 weeks after infection


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They cant replicate on food/water

Viruses need living cell to be able to replicate (parasyte)

MAP is not effective

Survive for 30 minutes at 60

o

C FCV cant be detected again when treated with boiling water for 1

min (inner T >70oC)

FCV Inactivated with high hydrostatic pressure and irradiation

NoV Only survive for 3 hours at pH 2.3 at ambient T

FCV survive at 4oC for 20 days on juice/milk/veggies/fruit

Freezing for 2 days: can reduce FCV for upto 2 log on strawberry

7 days at ambient T : FCV still can be found on environmentalsurfaces

Chlorine 200 ppm: 0-2.9 log reduction on FCV (E. coli: 5.5 log)


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Page 8Baert, L., Debevere, J., & Uyttendaele, M. 2009. The efficacy of preservation methods toinactivate foodborne viruses. International Journal of Food Microbiology, 131: 83-94.
http://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdf


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Based on NoVcharacteristic and stability,NoV may survive in:

Inadequate temperature

- rare steak(


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Cooks still cooked eventhough theyre sick

(Infected Food Handler)

Cooks didnt wash their hand or inadequate

handwashing and then they touched and preparethe food

Food was washed with water that might already hadbeen infected from the chefs

Cooking utensil, environmental surface that mightbe infected with viruses trasnmitted by the chefscontaminated the foods

Food was served fresh, raw, and without heating (minimal

processing) /FRESH SALADInadequate heating temperature of food (


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Page 12

Symptoms and Incubation Time of NoV

Incubation time: 24 48 jam

Duration : 12 60 jam

Symptoms:

acute gastroenteritis

Nausea, diarrhea, vomit, stomach cramp

Dehydration and malnutrition It could be fatal

if not treated, especially for childern, elders, and

immunosuppressed people

30% NoV infection are asymptomatic

But, in general: Norovirus infections are not

usually dangerous


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Page 13

Kaplans Criteria

70 % of NoVs outbreaks fit these categories

1 Duration of sickness 12-60 hours

2 Incubation time 24-48 hours

3 More than 50% people are vomiting

4

Patoghen bacteria cannot be found in feses


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Page 14

Outbreak Scenario of Norovirus

Chefs

(feses,vomit)

Fresh salad,Rare steak

Environmetalsurface

Water, air

Passengers/crews

Crowded room,small space

-Present when people vomit

-Sharing food and utensils

-Caring for sick people

-Handshake


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Page 15

Epidemiology

study review medical

log, interview,questionnaire

Sanitationinspection

cara penanganganmakanan, cara praktekpersonal hygiene,fasilitas, suhu udara dll

Spesimen collection Fecal, vomit, serum, environmet and

food swab

spesimen identification

Electron Microscope EIA or ELISA Serology

RT-PCR (Reverse TranscriptasePCR)

Detection of NoV at outbreak

- - ELISAs sensitifity < 50 %, but can be a rapid method for detection during outbreak

The most sensitive : RT-PCR- If NoV(+) : sequencing and genotyping


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REFERENCES

http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/2011/ucm278659.htm http://www.kalbe.co.id/?mn=news&tipe=detail&detail=1933

Baert, L., Debevere, J., & Uyttendaele, M. 2009. The efficacy of preservation methods toinactivate foodborne viruses. International Journal of Food Microbiology, 131: 83-94.

Doyle, M.P., Beuchat, L.R., & Montville, T.J. 2001. Food Microbiology, Fundamentals andFrontiers, 2ndEdition. Washington, DC: AMS Press.

Jay, J.M. 2000. Modern Food Microbiology, Sixth Edition. Gaithersburg: AspenPublishers, Inc.

Khan, A.S., Moe, C.L., Glass, R.I., Monroe, S.S., Estes, M.K., Chapman, L.E., Jiang, X.,Humphrey, C., Pon, E., Iskander, J.K., Schonberger, L.B. 1994. Norwalk Virus-Associated Gastroenteritis Traced to Ice Consumption aboard a Cruise Ship in Hawaii:Comparison and Application of Molecular Method-Based Assays. Journal of Clinical

Microbiology, 32: 318-322. Vivancos, R, Amir S., Margaret S., Heather A., Chris I. G, Linda M., Hamid M., Pat N.

2009. Food-related norovirus outbreak among people attending two barbeques :epidemiological, virological and environmental investigation. International Journal ofInfectious Diseases 13: 629635
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/2011/ucm278659.htmhttp://www.kalbe.co.id/?mn=news&tipe=detail&detail=1933http://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/norwalk%20virus%20cruise%20hawaii.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://localhost/var/www/apps/conversion/current/tmp/scratch_6/NoV/efektivitas%20preservasi%20noV.pdfhttp://www.kalbe.co.id/?mn=news&tipe=detail&detail=1933http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/2011/ucm278659.htm

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