Observations on the infectivity and pathogenicity of three isolates of Ostertagia spp sensu lato in calves

Ia, Saqur; Armour, J.; Bairden, K.; Am, Dunn; Fw, Jennings; Murray, M.

doi:10.1016/s0034-5288(18)32447-0

Cited by 17 publications

(2 citation statements)

References 9 publications

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“…Some findings indicate that O. leptospicularis is highly pathogenic, especially in cattle. It has been proved that its infectivity and pathogenicity in young cattle is higher when compared with blood sucking Ostertagia ostertagi (Stiles, 1892) [ 4 ]. Moreover, the overall intensity of infection increases if O. leptospicularis co-occurs [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Morphometric and Molecular Analyses of Ostertagia leptospicularis Assadov, 1953 from Ruminants: Species Diversity or Host Influence?

Wyrobisz-Papiewska

Kowal

Łopieńska–Biernat

et al. 2021

Animals

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Ostertagia leptospicularis Assadov, 1953 was formally described in roe deer Capreolus capreolus and has been reported in a wide range of ruminants, including other Cervidae, as well as Bovidae. Nematode specimens derived from various host species exhibit morphological similarity; however, some differences can be observed. It is unclear if this is due to the differential reaction of one nematode species in different host species (i.e., host-induced changes) or because of distinct nematode species in these hosts (i.e., species complex). This paper focuses on specimens resembling O. leptospicularis f. leptospicularis and its closely related species (Ostertagia ostertagi f. ostertagi) collected from various hosts. Morphometric and molecular techniques were applied to assess host-induced changes in nematode morphology and to clarify its systematic classification. There was an overall effect of host species on measurements of nematodes resembling O. leptospicularis (both males and females), but the distinctiveness of the specimens from cattle Bos taurus were highlighted. The results obtained may suggest that the specimens of O. leptospicularis from cattle in Germany and cervids in central Europe belong to different strains. Furthermore, nematodes from the cervid strain appear to circulate within particular host species, which can be seen in the stated morphological variations.

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Section: Introductionmentioning

confidence: 99%

Morphometric and Molecular Analyses of Ostertagia leptospicularis Assadov, 1953 from Ruminants: Species Diversity or Host Influence?

Wyrobisz-Papiewska

Kowal

Łopieńska–Biernat

et al. 2021

Animals

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“…Ostertagia mossi has yet to be reported from sheep or cattle; however, it could be easily mistaken for 0. leptospicularis. This latter species is considered pathogenic in Cervus elaphus L. (see Dunn, 1983) and has been implicated in ostertagiasis in cattle in the United Kingdom and New Zealand (Al Saqur et al, 1982a, 1982b, 1984Sulger Btiel et al, 1984;Bisset et al, 1984). Although disease has not been associated with infections of O. leptospicularis in Oregon or Montana, reports from the United Kingdom suggest the potential for ostertagiasis due to this species.…”

Section: Discussionmentioning

confidence: 99%

Comparative morphology of Ostertagia mossi and Ostertagia dikmansi (trichostrongylidae) from Odocoileus virginianus and comments on other Ostertagia spp. from the Cervidae

1993

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The synlophes of Ostertagia mossi Dikmans, 1931 and O. dikmansi Becklund &Walker, 1968 were found to be identical supporting recognition of these as the major and minor morphotypes, respectively, of a putative species pair within the Ostertagiinae. The cervical synlophe included three narrowly spaced, continuous, parallel ridges laterally and three parallel but more widely spaced ridges in the dorsal and ventral fields (Type II and Type A patterns, respectively). The disposition of the synlophe in conjunction with a long oesophageo-intestinal valve, and attributes of the genital cone and spicules are characteristics shared among other Ostertagia spp. from cervids in the Holarctic region that allow recognition of a species group morphologically distinct from the Ostertagiinae of domestic ruminants. The morphological similarity of O. mossi/O, dikmansi, O. leptospicularis Assadov, 1953/O. kolchida Popova, 1937 and O. gruehneri Skrjabin, 1929/O. arctica Mitzkewitsch, 1929 is substantial, but these species can be differentiated by small but constant differences in the synlophe and genital complex of males; females cannot be easily distinguished. The morphological similarity of this cryptic complex of species and their relatively restricted distribution among cervids suggests a coevolutionary history for hosts and parasites in the Holarctic region.

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Experimental studies on the interaction between infections ofOstertagia leptospicularis and other bovineOstertagia species

et al. 1984

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Experimental infections of calves were carried out with either isolates of predominantly Ostertagia ostertagi, pure O. leptospicularis or a mixed isolate of equal numbers of both these species. The total worms established on day 21 for the mixed species from a total inoculum of 100 000 infective larvae, was 1.2 times greater than from 100 000 larvae of the O. ostertagi isolate and 3.3 times that of the pure O. leptospicularis isolate. The increased establishment in the mixed inoculum referred to both O. ostertagi and O. leptospicularis (days 17 and 21). These differences were both highly significant (P less than 0.01). The severity of the pathological changes was also greater in the mixed infections. It is suggested that these findings must be taken into account when control measures involving alternate grazing of sheep and cattle are being employed.

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Observations on the infectivity and pathogenicity of three isolates of Ostertagia spp sensu lato in calves

Cited by 17 publications

References 9 publications

Morphometric and Molecular Analyses of Ostertagia leptospicularis Assadov, 1953 from Ruminants: Species Diversity or Host Influence?

Morphometric and Molecular Analyses of Ostertagia leptospicularis Assadov, 1953 from Ruminants: Species Diversity or Host Influence?

Comparative morphology of Ostertagia mossi and Ostertagia dikmansi (trichostrongylidae) from Odocoileus virginianus and comments on other Ostertagia spp. from the Cervidae

Experimental studies on the interaction between infections ofOstertagia leptospicularis and other bovineOstertagia species

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