Studies on the relationship between <i>Eimeria acervulina</i> and <i>Eimeria mivati</i>

Long, P. L.

doi:10.1017/s0031182000046370

Cited by 34 publications

(43 citation statements)

References 15 publications

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“…This no doubt explains the immunological cross-reactions we observed in our studies -a situation analogous to that of Long (1973). Fortunately for us, the experiments showing that the two organisms will not inter-breed are wholly reliable; due to the fact that E. acervulina is basically more sensitive to methyl benzoquate than E. mivati, repeated passage of Edgar's E. mivati in the presence of drug led to the production of a pure drug-resistant line of E. mivati, which would not inter-breed with resistant lines of E. acervulina.…”

Section: Immunological Controlsupporting

confidence: 65%

Recent developments in coccidian biology; where do we go from here?

Ryley¹

1980

Parasitology

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Trends and PerspectivesT R E N D S AND P E R S P E C T I V B S is a series of articles which are intended to: 1. Focus attention on developing and growing topics in parasitology. 2. Identify new and old problems in need of research. 3. Explain how results from one area of biology might have some bearing on current studies in parasitology. 4. Present teachers and students with concise summaries of recent discoveries and new theories. None of the articles will take the form of a detailed historical survey of the literature. In seeking contributions for the series, the editors have urged authors to present clear and stimulating personal points of view about those topics which have excited their curiosity and imagination. The editors hope that a wide readership will gain enjoyment and benefit from this enterprise.

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Section: Immunological Controlsupporting

confidence: 65%

Recent developments in coccidian biology; where do we go from here?

Ryley¹

1980

Parasitology

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“…The shape of the oocysts remained constant. Long (1973] found that oocysts of E, mivati differed in size and shape depending upon whether they were derived from infections in embryos or chickens. With the embryo-adapted strain the oocysts were almost spherical, but with passage in chickens they assumed the dimensions and shape of those of E. acervulina.…”

Section: Oocyst Size and Shapementioning

confidence: 99%

The specific characters of the Eimeria, with special reference to the Coccidia of the fowl

Joyner

Long

1974

Avian Pathology

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The differentiation of species of Eimeria is discussed with special reference to those occurring in the domestic fowl. Details of the morphology of the oocysts and other developmental stages of the parasites, their location in the host and the characteristics of the lesions produced, the timing of the patent and prepatent periods, host- and site-specificity and immunological specificity may be used as aids for specific identification. A single criterion is usually insufficient for differentiation and depending upon the species, different characters vary in significance. Quantitative cross-immunity tests appear to be the most satisfactory means available for the differentiation of species of Eimeria affecting chickens.

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“…mivati used in this study is somewhat confused. In an earlier study, Long (1973) concluded that/?, mivati was probably a variant off. acervulina because it cross-protected against E. acervulina.…”

Section: Introductionmentioning

confidence: 98%

Eimeria:Further studies on the immunisation of young chickens kept in litter pens

Long

Millard

1979

Avian Pathology

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SUMMARYChickens were inoculated with small numbers of oocysts of attenuated (E. tenella TA and E. mivati MA) and virulent strains of E. acervulina, E. brunetti, E. maxima and E. necatrix under conditions designed to permit reinfection. Chickens were immune to challenge with pathogenic laboratory strains 6 weeks after inoculation with either the homologous strains or attenuated derivatives. Immunity to challenge with heterologous strains was also achieved, except that it was incomplete with E. maxima. To obtain complete protection against heterologous challenge with E. maxima, it was necessary to immunise with several strains.Chickens immunised at 1 or 2 weeks of age showed a stronger immunity than birds immunised at 1 day old when challenged at 6 weeks of age. The effect of inoculating chickens with 0.1-10 times a standard immunising dose was examined. Chickens given 0.1-1 times the standard dose were substantially immunised but body weight gain was reduced with higher doses. The results show that controlled immunisation of 1-or 2-week-old chickens against six species of Eimeria is possible, and that a substantial degree of immunity develops within 2 weeks of exposure. This immunity was effective for at least 18 weeks. INTRODUCTIONIn an earlier communication we showed that 2 to 4-week-old chickens, kept in litter pens, and given a single dose of oocysts of attenuated strains of Eimeria mivati and E. tenella, and small numbers of oocysts of laboratory strains of E. acervulina, E. bninetti and E. maxima acquired immunity to challenge infections (Long and Millard, 1977a). It was concluded that controlted immunisation of chickens against the important species oi Eimeria was possible and that immunisation under these conditions did not have a serious effect on performance.

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Studies on the relationship between Eimeria acervulina and Eimeria mivati

Cited by 34 publications

References 15 publications

Recent developments in coccidian biology; where do we go from here?

Recent developments in coccidian biology; where do we go from here?

The specific characters of the Eimeria, with special reference to the Coccidia of the fowl

Eimeria:Further studies on the immunisation of young chickens kept in litter pens

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