Chapter 29 : Helminths in Meat

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Foodborne parasites have undoubtedly had an impact on human health throughout history. There are four meat-borne helminths of medical significance: spp., , and , which occur primarily in pork, and , which is found in beef. Encapsulated species of have been found only in mammalian hosts. All species of complete their life cycle within one host; no intermediate hosts or extrinsic development is required. Infection in humans typically represents a dead end in the parasite’s life cycle. Trichinellosis, human disease resulting from infection with species of the genus , is considered a zoonosis because infection occurs as a result of ingestion of raw or poorly cooked meat from infected animals. Damage caused by infection varies with the intensity of the infection and the tissues invaded. Classical symptoms of trichinellosis include fever, myalgia, and periorbital edema, and these symptoms may vary depending on the species of . Mebendazole is also believed to be active against developing and encysted larvae but at dosages higher than those used against adult worms. Taeniasis results when raw or inadequately cooked beef containing tissue cysts is consumed. Chronic persistence of and periodic increases in human infections correlate with factors that govern infections in cattle.

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.1
Figure 29.1

Scanning electron micrograph of female adult worm of with its prominent vulval opening (×2,450).

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.2
Figure 29.2

Scanning electron micrograph of male adult of with its copulatory bell (×1,400).

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.3
Figure 29.3

Pressed muscle containing larvae.

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.4
Figure 29.4

Gravid proglottid of . Note at least 16 lateral uterine branches.

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.5
Figure 29.5

egg (×590).

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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Image of Figure 29.6
Figure 29.6

Gravid proglottid of . Note fewer lateral uterine branches than in in Fig. 29.4 .

Citation: Gamble H, Zarlenga D, Kim C. 2007. Helminths in Meat, p 629-648. In Doyle M, Beuchat L (ed), Food Microbiology: Fundamentals and Frontiers, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815912.ch29
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