ASCI 211 Midterm III Parasites and Viruses

T or F: All enteric viruses contain RNA, have protein capsid, and are non-enveloped

False, Adenovirus does not contain

T or F: Enteric viruses require a living host to multiply

T

What is the mode of transmission for Enteric Viruses

Fecal to oral, food as a vector

T or F: Enteric viruses have a high infectious dose

False, low infectious dose

T or F: Enteric viruses are resistant to environmental stress such as freezing and drying and hydrostatic pressure

T

What is the infective dose for hepatitis A

10-100 particles

What are the symptoms for Hepatitis A

Fever, malaise, nausea, abdominal discomfort, jaundice

What is the incubation period for Hepatitis A

2-6 weeks

T or F: Hep. A has a low heat resistance

False, high head resistance

What is the infective dose for norovirus

10-100 particles

Norovirus has a high attack rate of what percent

50-70%

T or F: Norovirus is responsible for up to 20% US foodborne disease

False, 60%

What are symptoms of Norovirus

Vomiting, dehydration, diarrhea

The virus head is made of a protein sheath called what…

Capsid

What setting is 5000ppm NaCl soln disinfection used in against enteric viruses?

Home, kitchen, restuarants

What setting is a 2% glutaraldehyde soln used in against enteric viruses?

Hospitals

What setting is a quaternary ammonium with 23% HCl soln used in against enteric viruses?

poultry

What type of parasite is giardia

Protozoa

What is the source of most parasites

Contaminated water, food in contact with contaminates

Fill in the blank: One animal can be a BLANK host and one can be a final or BLANK host

Primary, Definite

How are parasites mainly spread (cyst)

Produce cysts that are ingested in excyst in host

T or F: Entamoeba Histolytica is tapeworm

False, protozoa

Entamoeba Histolytica has similar symptoms to what virus?

E. Coli, ameobic dysentery

Toxoplasma Gondii is what type of parasite

Protozoa

sources of toxoplasma gondii

Oocytes shed from cats and undercooked meat

How do you control against Toxoplasma Gondii

Avoid cat poop and cook meat products above 60C

T or F: Cryptosporidium Parvum is protozoa

T

T or F: Cryptosporidium cannot survive well in Cl

F

How is Cyclospora Cayetanensis acquired

Eating food or drinking water contaminated with human feces

T or F: Rinsing fresh produce can eliminate the chance of getting cyclospora

False, rinsing can reduce, but not eliminate

What type of parasite is Taenia

Cestode, tapeworm

What species of Taenia is in pork

T. Asiatic and T. Solium

What type of Taenia is in beef

T. Songitum

How do cestode parasites attach

With scolex to intestinal wall

How are eggs transmitted

They are ingested, hatch, and larvae move to muscle

What kind of parasite is diphyllobothrium latum

Cestode

What are sources of diphyllobothrium latum

Undercooked, marinated fish

T or F: Vit. B-12 deficiency is a symptom for Diphyllobothrium latum

T

What type of parasite is Trichinella Spiralis

Roundworm

Fill in the blank: Trichinella eggs hatch and larvae burrow through … then move to …

gut wall, muscle tissue

During 1997 to 2001, how many cases of Trichinella were reported from bear meat?

33 cases

This percent of the population was affected by Trichinella between 1930s-1940s

16%

What type of parasite is Anisakis?

Roundworm

What is anisakis associated with

Seafood