CPFS Foodborne Illness & Pathogens 2

Question 1

Which food product is most commonly associated with Salmonella Enteritidis contamination?

Accepted Answer

Shell eggs and egg-containing dishes

Answer

Raw oysters

Answer

Unpasteurized juice

Answer

Deli meats

Question 2

Listeria monocytogenes is especially hazardous in a foodservice setting because it can grow under which unusual condition?

Accepted Answer

At temperatures as low as 32°F (0°C), including refrigeration temperatures

Answer

Only in high-acid environments below pH 4.6

Answer

Exclusively in dry, low-moisture foods

Answer

Only in the presence of oxygen above 21%

Question 3

Norovirus outbreaks in foodservice establishments are most frequently linked to which vehicle of transmission?

Accepted Answer

Raw shellfish, especially oysters, or infected food handlers

Answer

Undercooked ground beef

Answer

Improperly canned low-acid vegetables

Answer

Cross-contamination from raw poultry

Question 4

What is the minimum infectious dose for Norovirus, making it highly contagious in foodservice environments?

Accepted Answer

Fewer than 20 viral particles

Answer

At least 10,000 cells

Answer

Over 1 million colony-forming units

Answer

Exactly 500 spores

Question 5

Vibrio parahaemolyticus foodborne illness is most commonly associated with which type of food?

Accepted Answer

Raw or undercooked shellfish, especially oysters

Answer

Reheated rice dishes

Answer

Improperly processed canned goods

Answer

Soft cheeses made from raw milk

Question 6

Which practice most effectively prevents the transmission of Hepatitis A virus by food handlers?

Accepted Answer

Proper and frequent handwashing with soap and water for at least 20 seconds

Answer

Wearing gloves at all times without washing hands

Answer

Using hand sanitizer gel before handling food

Answer

Storing food at temperatures below 40°F

Question 7

Which symptom pattern is most characteristic of Bacillus cereus emetic (vomiting) syndrome?

Accepted Answer

Sudden vomiting within 30 minutes to 6 hours after eating starchy foods like fried rice

Answer

Watery diarrhea appearing 6–15 hours after eating contaminated beef

Answer

Bloody diarrhea 3–4 days after consuming raw sprouts

Answer

Neurological symptoms 12–36 hours after eating home-canned vegetables