Evidence map›Paper›PMID 19695712›Full record

ArticleVeterinary immunology and immunopathology2010

Variant-specific and diminishing immune responses towards the highly variable MSP2(P44) outer membrane protein of Anaplasma phagocytophilum during persistent infection in lambs.

Erik G Granquist, Snorre Stuen, Liliana Crosby, Anna M Lundgren, A Rick Alleman, Anthony F Barbet

Open access · greenAbstract read
In one paragraph

Article in Veterinary immunology and immunopathology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed
1.1field-weighted citation impact, top 25% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 35 citations in OpenAlex.

  1. Generation of Population-Level Diversity inPathogens (Basel, Switzerland) · 2025
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  2. Comparative Whole Genome Analysis of anPathogens (Basel, Switzerland) · 2022
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  3. Article
  4. Epidemiological and Clinicopathological Features ofFrontiers in veterinary science · 2021
    Review
  5. ExperimentalFrontiers in veterinary science · 2020
    Article
  6. Article
  7. Article
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  9. Antigenic Variation in Bacterial Pathogens.Microbiology spectrum · 2016
    Article
  10. Review
  11. Mini-review: Strategies for Variation and Evolution of Bacterial Antigens.Computational and structural biotechnology journal · 2015
    Review
  12. Article
  13. Article
  14. Review
  15. Article
  16. Review
  17. Review
  18. Article
  19. Prevalence ofJFMS open reports
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 2 institutions in 2 countries.

Erik G GranquistDepartment of Production Animal Clinical Sciences, Section of Small Ruminant Research, Norwegian School of Veterinary Science, Kyrkjevegen 332/334, Sandnes N-4325, Norway. erik.georg.granquist@veths.no
Snorre Stuen
Liliana Crosby
Anna M Lundgren
A Rick Alleman
Anthony F Barbet
University of Florida · USNorwegian University of Life Sciences · NO

Funding

MOLECULAR MECHANISMS OF MSP2 VARIATION IN RICKETTSIAER01AI045580 · NIAID · UNIVERSITY OF FLORIDA · PI BARBET, ANTHONY F. · 1999 to 2007
$2.0M
NIAID NIH HHS AI45580NIAID NIH HHS R01 AI045580
6 · The paper itself

Abstract

Anaplasma phagocytophilum is the causative agent of tick-borne fever in small ruminants and has been identified as the zoonotic agent of human granulocytic anaplasmosis. The Norwegian strains of the rickettsia are naturally persistent in lambs and represent a suitable experimental system for analyzing the mechanisms of persistence. Variation of the outer membrane protein MSP2(P44) by recombination of variable pseudogene segments into an expression site is believed to play a key role in persistence of the organism. The goal of the present study was to analyze the dynamics of the immune response towards A. phagocytophilum and MSP2(P44) during persistent infection of lambs. Responses to the hypervariable region of MSP2(P44) were detected shortly after appearance of the respective variants in cyclic rickettsemic peaks, consistent with a process of antigenic variation. In addition, there was a diminishing antibody response to MSP2(P44) and to other A. phagocytophilum antigens overall with time of infection, that was not associated with clearance of the infection.

Indexed as

Amino Acid SequenceAnaplasma phagocytophilumAnimalsAntibodies, BacterialAntigenic VariationBacterial Outer Membrane ProteinsBase SequenceDNA PrimersEhrlichiosisGenes, BacterialHumansMolecular Sequence DataNorwayPeptide FragmentsPseudogenesRecombinant ProteinsAntibodies, BacterialBacterial Outer Membrane ProteinsDNA Primersmsp2 protein, Anaplasma phagocytophilumPeptide FragmentsRecombinant Proteins

Identifiers

PMID19695712
PMCPMC2815256
OpenAlexW2052428239

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.