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Mad Cow Disease: Dealing Sensibly with a New Concern

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Mad Cow Disease: Dealing Sensibly with a New Concern JFP_08.04_PracticeAlert.final 7/20/04 9:19 AM Page 645 Practice Alert P UBLIC H EALTH I SSUES I NFLUENCING Y OUR P RACTICE Mad Cow disease: Dealing sensibly with a new concern Eric Henley, MD, MPH University of Illinois College of Medicine at Rockford; School of Public Health, University of Illinois at Chicago Jack Herrmann, DVM, MPH AVMA/AAAS Congressional Science Fellow, Washington, DC fter a period out of the spotlight, Mad vCJD had been reported worldwide, most in the Cow disease is again causing a stir. UK. Confirmation of either the classic or variant Following the first documented case in form requires pathology examination of brain A 1 this country on December 23, 2003, the US gov- tissue collected by biopsy or, if a patient has died, ernment is instituting new preventive measures, at autopsy.2 and patients may be asking for assurances of safe- ty (see “What to advise patients,” page 565). Uniqueness of vCJD In medical school, family physicians learned Mad Cow’s connection to humans: vCJD about classic CJD, which is endemic throughout Mad Cow disease is the bovine form of transmis- the world and, in the US, causes an average of sible spongiform encephalopathy (TSE), a disease 1 death per million people per year. The epidemi- that can also affect sheep, deer, goats, and ology of vCJD and CJD are quite different (Table humans (Table 1). The causative agent is thought 2). Because vCJD is a new disease, its incubation to be an infective protein called a prion, discov- period is unknown, but it is likely to be years or ered in 1997. decades. In the UK it is thought that exposure to Bovine spongiform encephalopathy (BSE) was BSE-contaminated food from 1984–86 and the first identified in the United Kingdom in 1986 and onset of vCJD cases in 1994–96 is consistent with caused a large outbreak in cattle, which peaked in such a long incubation period. 1993. Subsequently, it was discovered that BSE Since 1986, BSE has been identified in 20 could rarely spread to humans, causing a variant European countries, Japan, Israel, Canada, and of Creutzfeldt-Jakob disease (vCJD) that is univer- now the US. The main method of its spread sally fatal. As of December 2003, 153 cases of through herds is believed to be the former prac- tice of feeding cattle the meat and bone meal products that, at some point, were contaminat- Corresponding author: Eric Henley, MD, MPH, Co-Editor, Practice Alert, 1601 Parkview Avenue, Rockford, IL 61107. ed with BSE. In 1997, the US and Canada pro- E-mail: [email protected]. hibited the feeding of ruminant meat and bone AUGUST 2004 / VOL 53, NO 8 · The Journal of Family Practice 645 JFP_08.04_PracticeAlert.final 7/20/04 9:19 AM Page 646 PRACTICE ALERT TABLE 1 Transmissible spongiform encephalopathies Species affected Prion disease Transmissible to humans? Mink Transmissible mink encephalopathy No Sheep and goats Scrapie Historically no; questionable in newly discovered atypical cases Deer and elk Chronic wasting disease Possible (under investigation) Cattle and bison Bovine spongiform encephalopathy Yes (variant CJD) Humans Creutzfeldt-Jakob disease; variant Through contaminated medical CJD, Gerstmann-Straussler-Scheinker products, instruments, possibly blood disease, Kuru, fatal familial insomnia meal to other ruminants. It is thought that most annual testing of between 5000 and 20,000 cattle cases of vCJD are transmitted to people when slaughtered for human consumption (out of about they eat beef products containing brain or 35 million cattle slaughtered per year). spinal cord material contaminated with BSE. Since December 30, 2003, the US Department Neuropathology. Variant CJD deposits of Agriculture (USDA) and Food and Drug plaques, vacuoles, and prion protein in the brain. Administration (FDA) have added or proposed a To date, all persons with vCJD have had methio- number of additional provisions to prevent BSE: nine homozygosity at the polymorphic codon 129 1. Defining high-risk materials banned for of the prion protein gene, suggesting that per- human consumption, including the entire verte- sons not carrying this genotype (who make 60% bral column. of the population) have increased resistance to 2. Banning the use of advanced meat recovery the disease. In addition, vCJD and BSE are both systems on vertebral columns. These systems dose-dependent infections, so both genetics and use brushes and air to blast soft tissue off of bone exposure may explain why so few human cases and led to up to 30% of hamburger sampled to be have occurred despite the widespread outbreak contaminated with central nervous system tissue. of BSE in the UK. 3. Proposing an expanded annual surveillance to include about 200,000 high-risk cattle (sick, Prevention measures have been updated suspect, dead) and a random sample of 20,000 Before December 30, 2003, prevention measures normal cattle over 30 months old. in place to prevent BSE in this country were the following: But are these measures enough? 1. Import restrictions on bovine-derived Concerns about these new measures center on consumer products from high-risk BSE countries the surveillance program. First, how long will it (initiated in 1989). take the USDA to expand its testing? Second, will 2. Prohibition of the use of ruminant derived even this expanded testing be sufficient? Some meat and bone meal in cattle feed (initiated in scientists and consumer advocates propose 1997). adopting the policy of the European Union, which 3. A surveillance system for BSE that involved is to test all cattle over 30 months of age, since 646 AUGUST 2004 / VOL 53, NO 8 · The Journal of Family Practice JFP_08.04_PracticeAlert.final 7/20/04 9:19 AM Page 647 PRACTICE ALERT TABLE 2 Characteristics distinguishing vCJD from CJD Characteristic UK vCJD US classic CJD Median age at death 28 (range, 14–74) 68 (range, 23–97)* Median illness duration (mo) 13–14 4–5 Clinical presentation Prominent psychiatric/ Dementia; early behavioral symptoms; delayed neurologic signs neurologic signs Periodic sharp waves on EEG Absent Often present “Pulvinar sign” on MRI† Present in >75% of cases Not reported Presense of “florid plaques” Present in great numbers Rare or absent on neuropathology Immunohistochemical Marked accumulation of PrPres Variable accumulation analysis of brain tissue Presense of agent in Readily detected Not readily detected lymphoid tissue Increased glycoform ratio on Present Not present immunoblot analysis of PrPres Genotype at codon 129 Methionine/Methionine Polymorphic of prion protein *Surveillance data 1997–2001. † High signal in the posterior thalmus. CJD; Creutzfeldt-Jakob disease; vCJD, variant CJD; EEG, electoencephalogram; MRI, magnetic resonance imaging; PrPres, protease-resistant prion protein. Source: Centers for Disease Control and Prevention, MMWR Morb Mortal Wkly Rep 2004; 52:1280–1285.1 this age group can harbor BSE without being ill. To date, the beef industry has supported the Other congressional proposals include ban- changes already put into effect, but not the addi- ning all high-risk meat products from all animal tional ones noted above. Ironically, a number of feeds and cosmetics, and creating a prion disease small, upscale slaughterhouses have proposed task force to coordinate surveillance and testing all cattle they slaughter (mostly under research for all prion diseases. Unfortunately, 30 months old) so they may resume sales to because we have been testing so few cattle for Japan. The USDA has turned down their requests BSE, we don’t really know if there are more for the chemical reagents to run the BSE tests infected cattle in our food system. Interestingly, (the agency controls the sale of these kits), citing in Japan, where all cattle are tested for BSE after its concern that testing all cattle would give the slaughter, 10 more infected animals were discov- impression it is necessary for the entire US ered, most of which lacked the characteristics herd—a proposition the USDA and many that would put them at high risk.3 scientists believe is unnecessary. Thus, the AUGUST 2004 / VOL 53, NO 8 · The Journal of Family Practice 647 JFP_08.04_PA.final.REV 7/20/04 2:14 PM Page 648 PRACTICE ALERT controversy over BSE surveillance has now become an economic, political, and scientific The first US case issue. Federal agencies, Congress, and the public What to advise patients became more aware of BSE on December 23, The risk of contracting vCJD from eating con- 2003, when the US Department of Agriculture taminated beef is extremely small.4 (USDA) diagnosed the disease in a dairy cow in There has yet to be a case of BSE found in Washington state.1 The cow, traced to a herd orig- any native-born US cattle. inating in Canada, was 6.5 years old and had been There is no association between BSE and slaughtered on December 9.Whether the cow was milk or milk products. a “downer” (nonambulatory) is still under investiga- If traveling to countries where BSE is endem- tion. Downer cows are automatically tested; how- ic—ie, UK and Portugal—patients may avoid ever, it is possible this cow was tested as part of a beef altogether or limit consumption to whole routine surveillance system rather than because it cuts, not ground beef or sausage.5 was at high risk of disease. Regardless, the car- Avoid bovine-derived nutritional supple- cass was released for use as food while tissues ments, especially those containing bovine pitu- considered more risky for BSE transmission itary, thyroid, adrenal, thymus, or other organ (brain, spinal cord, and small intestine) were kept tissue. from the human food supply. Avoid products containing bovine meat or bone After the case was diagnosed, the USDA recalled meal, such as some types of garden fertilizers. all meat from cattle slaughtered at that plant the same Deer and elk can develop chronic wasting dis- day.
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