Morphologic descriptions of Taenia asiatica sp. n

Abstract

Among taeniid tapeworms infecting humans through pork or beef, Taenia solium Linnaeus 1758 and Taenia saginata Goeze 1782 have already been known. Based on the morphologic characteristics of adult and metacestodes of Asian Taenia saginata, the third kind of human taeniid tapeworm known to distribute in Asian countries, a new species name of Taenia asiatica is proposed. In addition to the known biology in their intermediate hosts, T. asiatica was different morphologically from Taenia saginata Goeze 1782 in having the unarmed rostellum on the scolex of adult, the large number of 'uterine twigs' and the existence of 'posterior protuberance'. These structures in the gravid proglottids were used as taxonomic keys in taeniid tapeworms for the first time. T. asiatica metacestode (Cysticercus viscerotropica) was different morphologically from T. saginata metacestode (Cysticercus bovis) in having wartlike formations on the external surface of the bladder wall.

High prevalence of Taenia saginata taeniasis and status of Taenia solium cysticercosis in Bali, Indonesia, 2002–2004

“…Cysticercosis cases were suspected by questionnaires on the history of epileptic seizures, detection of subcutaneous nodule by palpation and serological examination for T. solium cysticercosis . All tapeworms expelled from tapeworm carriers were confirmed by mtDNA analysis using cytochrome c oxidase subunit I (cox1) gene to differentiate T. solium, T. saginata and T. asiatica (Yamasaki et al, 2004a(Yamasaki et al, , 2004b(Yamasaki et al, , 2004c, since proglottids of T. saginata and T. asiatica are morphologically identical (Fan 1988;Eom and Rim, 1993;Ito et al, 2003; and T. asiatica was also expected to be distributed in Bali (Dharmawan, 1998). Additional data through questionnaires from 106 family heads were also collected in a non-endemic Taenia area (Banjar) in East Denpasar Sub-District (Denpasar District) as a family control for the 106 family heads living in the taeniasis endemic area (Banjar) in Ketewel and Penatih villages.…”

Caracterização das lesões por Cysticercus bovis, na inspeção post mortem de bovinos, pelos exames macroscópico, histopatológico e pela reação em cadeia da polimerase (PCR)

“…Considerando a maior prevalência de teníase por T. saginata (Dias et al 1991, Esteves et al 2005, bem como a similaridade morfológica entre T. saginata e T. asiatica (Eom & Rim, 1993, Fan et al 1995, que é considerada exótica no país, aliadas à endemicidade de cisticercose humana em muitos estados brasileiros (Machado et al 1988, Agapejev 1996, Takayanagui & Leite 2001, Mendes et al 2005 e às baixas taxas de ocorrência da cisticercose suína (Alves 2000, Flavigna-Guilherme et al 2006), ao contrário do que se observa em bovinos, torna-se imperiosa a necessidade de aprofundar as análises moleculares, com vistas ao esclarecimento de muitos pontos controversos que permanecem no universo cientíϐico, a começar com a possibilidade dos ovos de T. saginata causarem cisticercose no homem, conforme admitiram Santos (1996) e outros autores citados por Pardi et al (2001). Quanto à identiϐicação de C. bovis nos diversos sítios anatômicos estudados, mais uma vez destaca-se a importância de se tornar rotina nos matadouros, os exames de esôfago e ϐígado, pois os resultados encontrados na PCR conϐirmaram o diagnóstico ambulatorial feito nessas localizações.…”

Comparative analysis of the miRNA profiles from Taenia solium and Taenia asiatica adult

“…asiatica is morphologically and phylogenetically close to T. saginata and T. solium and pig is the intermediate host (Eom and Rim, 1993). T. asiatica is an important human parasite in Asian countries including Korea, China, Taiwan, Thailand, Indonesia, Vietnam, Japan and the Philippines (Nakao et al, 2002).…”

“…Due to the special eating habits of local people in Asian countries, pork and pig visceral organs including the liver, omentum, serosa, and lung have been the main dishes in daily food. Moreover, in some rural areas, people are likely to consume uncooked or raw meat (Eom and Rim, 1993;Ito et al, 2004;Murell, 2005). This eating habit has led to the high occurrence of taeniasis, especially those caused by T. solium and T. asiatica.…”