Secretary of Agriculture Emphasizes Safety of U.S. Pork
Secretary of Agriculture Tom Vilsack issued a statement today emphasizing that U.S. pork products are safe and that there is no evidence that U.S. swine have been infected with the swine flu virus.
Calling trade restrictions on pork or pork products unnecessary, Vilsack said any such restrictions would be inconsistent with World Organization for Animal Health guidelines. “[I]t is not necessary to introduce specific measures for international trade in swine or their products, nor are consumers of pork products at risk of infection,” Vilsack said. The complete statement is available here.
A report in The New York Times notes that pork producers are questioning whether it is appropriate to call the virus “swine flu” given that there is no evidence of swine infection. The report states that officials in Thailand, one of the world’s largest meat exporters, have started calling the virus “Mexican flu.” An Israeli deputy health minister reportedly said Israel would follow suit to keep Jews from having to say the word “swine.”
Pork Producers Feel Effects of Swine Flu
Pork producers are feeling the effects of the swine flu as the number of reported cases of the virus increases. Stock prices for Virginia-based Smithfield Foods, the world’s largest pork processor, and Arkansas-based Tyson Foods, fell 12 percent and 9 percent today, respectively. The Wall Street Journal reports that the prices of hogs, corn, and soybeans also dropped today. About 16 percent of U.S. pork exports have been shipped to Mexico over the past year – a country where so far 149 people have died from the swine flu.
The Centers for Disease Control and Prevention and other health officials have emphasized that swine flu viruses are not transmitted by food and people cannot contract the virus by eating pork or pork products. That fact alone does not seem to be enough to quell consumers’ fears. MarketWatch earlier today quoted a pork industry analyst as saying the industry wants to avoid a slip of exports and prices akin to the 2003 avian flu outbreak in Asia. Analyst Heather Jones said she believes the pork industry “needs to undertake an aggressive and widespread informational marketing campaign.”
Meanwhile, the Associated Press is reporting that Seattle-based Starbucks Corp. announced today that it is closing 10 of its Mexico City cafes in response to the swine flu outbreak and pursuant to instructions from the Mexican government.
Is It Really A Food-Borne Illness?
At a recent presentation, Dr. Alan Melnick, a public health officer in both Oregon and Washington, provided a useful list of alternative causes of symptoms to consider when someone claims a food-borne illness. Other causes of symptoms that might be confused for food-borne illness include (but may not be limited to):
- Irritable bowel syndrome (IBS)
- Inflammatory bowel disease
- Malignancies
- Antibiotic use
- Gastro-intestinal surgery or radiation
- Malabsorption syndromes
- Immune deficiency
Another practical piece of advice offered by Dr. Melnick: When assessing a food-borne illness claim, determine whether the incubation period is compatible with the illness. Incubation periods (along with other useful information) were provided by Dr. Melnick (relying upon the CDC) as follows:
|
Pathogen |
Incubation |
Symptoms |
Duration |
Source |
| Bacillus cereus |
1-6 hours (vomiting); 6-24 hours (diarrhea) |
Nausea and vomiting or colic and diarrhea | 24 hours (short form); 24-48 hours (long form) | Soil organism found in raw, dry and processed foods, e.d. rice |
| Campylobacter | 2-10 days; usually 2-5 days | Diarrhea, cramps, fever and vomiting; diarrhea may be bloody | 2-10 days | Raw and undercooked poultry, unpasteurized milk, water |
| Clostridium botulinum (botulism) | 2 hours to 8 days; usually 12-48 hours | Vomiting, diarrhea, blurred vision, double vision, difficulty swallowing, descending muscle weakness | Variable (days to months) | Home-canned food, improperly canned commercial foods |
| Clostridium perfringens | 6-24 hours | Cramps, diarrhea | 24-48 hours | Meats, poultry, gravy; foods kept warm |
| Enterro-hemorrhagic E. coli, including E. coli O157:H7 and other Shiga toxin-producing E. coli (STEC) | 1-10 days; usually 3-4 days | Diarrhea, frequently bloody; abdominal cramps (often severe); little or no fever; 5-10% develop Hemolytic-uremic syndrome (HUS) and average of 7 days after onset, when diarrhea is improving (more common in children, elderly and immune-compromised) | 5-10 days | Ground beef, unpasteurized milk and juice, raw fruits and vegetables, contaminated water, sprouts, person to person |
| Listeria | 9-48 hours for GI symptoms; 2-6 weeks for invasive disease | Fever, muscle aches and nausea or diarrhea; pregnant women may have flu-like illness and stillbirth; elderly, immune-compromised and infants infected from mother can get sepsis and meningitis | Variable | Fresh soft cheeses, unpasteurized or inadequately pasteurized milk, ready-to eat deli meats and hot dogs |
| Salmonella | 6 hours to 10 days; usually 5-48 hours | Nausea, diarrhea, cramps, fever | 4-7 days | Poultry, eggs, meat, unpasteurized milk or juice, raw fruits and vegetables (e.g., sprouts), person to person |
| Shigella | 12 hours to 6 days; usually 2-4 days | Abdominal cramps, fever and diarrhea; stool may contain blood and mucus | 4-7 days | Contaminated food or water, raw foods touched by food workers, raw vegetables, egg salads, person to person |
| Staph (toxin) | 30 minutes to 8 hours; usually 2-4 hours | Nausea, cramps, vomiting, diarrhea | 24-48 hours | Custards, cream fillings, potato or egg salad, sliced meats |
| Vibrio cholerae | 1-5 days | Profuse watery diarrhea and vomiting, severe dehydration | 3-7 days | Contaminated water and shellfish, street vended food |
| Vibrio parahaemolyticus | 4-30 hours | Watery diarrhea, abdominal cramps, nausea, vomiting | 2-5 days | Undercooked or raw seafood (fish and shellfish) |
| Vibrio vulnificus | 1-7 days | Vomiting, diarrhea, abdominal pain; more severe in patients with liver disease or who are immune-compromised; can cause invasive infection (sepsis) | 2-8 days | Raw seafood, particularly oysters, harvested from warm coastal waters |
| Yersinia | 1-10 days; usually 4-6 days | Appendicitis-like symptoms (diarrhea and vomiting, abdominal pain) | 1-3 weeks | Undercooked pork, unpasteurized milk, contaminated water |
