Evidence map›Paper›PMID 20709840›Full record

ArticleApplied and environmental microbiology2010

Comparison of single- and multilocus genetic diversity in the protozoan parasites Cryptosporidium parvum and C. hominis.

Giovanni Widmer, Yongsun Lee

Open access · greenAbstract read
In one paragraph

Article in Applied and environmental microbiology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed
3.0field-weighted citation impact, top 10% 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

27 citing papers in PubMed, 56 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. A review of recentCurrent research in parasitology & vector-borne diseases · 2025
    Review
  5. Current research in parasitology & vector-borne diseases · 2025
    Article
  6. Article
  7. Current tropical medicine reports · 2024
    Review
  8. Article
  9. Article
  10. Validation of a multilocus genotyping scheme for subtypingFood and waterborne parasitology · 2022
    Article
  11. Article
  12. Article
  13. Direct Sequencing ofFrontiers in public health · 2019
    Review
  14. Article
  15. Article
  16. Towards a consensus on genotyping schemes for surveillance and outbreak investigations of Cryptosporidium, Berlin, June 2016.Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin · 2016
    Article
  17. Article
  18. Review
  19. Review
  20. 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

2 authors at 1 institution in 1 country.

Giovanni WidmerTufts Cummings School of Veterinary Medicine, Division of Infectious Diseases, North Grafton, MA 01536, USA. giovanni.widmer@tufts.edu
Yongsun Lee
New England Disabled Sports · US

Funding

Genetics of Cryptosporidium parvumR01AI052781 · NIAID · TUFTS UNIVERSITY BOSTON · PI WIDMER, GIOVANNI · 2002 to 2010
$1.8M
Genetics of Cryptosporidium parvumR56AI052781 · NIAID · TUFTS UNIVERSITY BOSTON · PI WIDMER, GIOVANNI · 2008 to 2008
$293k
NIAID NIH HHS AI052781NIAID NIH HHS R01 AI052781NIAID NIH HHS R56 AI052781
6 · The paper itself

Abstract

The genotyping of numerous isolates of Cryptosporidium parasites has led to the definition of new species and a better understanding of the epidemiology of cryptosporidiosis. A single-locus genotyping method based on the partial sequence of a polymorphic sporozoite surface glycoprotein gene (GP60) has been favored by many for surveying Cryptosporidium parvum and C. hominis populations. Since genetically distinct Cryptosporidium parasites recombine in nature, it is unclear whether single-locus classifications can adequately represent intraspecies diversity. To address this question, we investigated whether multilocus genotypes of C. parvum and C. hominis cluster according to the GP60 genotype. C. hominis multilocus genotypes did not segregate according to this marker, indicating that for this species the GP60 sequence is not a valid surrogate for multilocus typing methods. In contrast, in C. parvum the previously described "anthroponotic" genotype was confirmed as a genetically distinct subspecies cluster characterized by a diagnostic GP60 allele. However, as in C. hominis, several C. parvum GP60 alleles did not correlate with distinct subpopulations. Given the rarity of some C. parvum GP60 alleles in our sample, the existence of additional C. parvum subgroups with unique GP60 alleles cannot be ruled out. We conclude that with the exception of genotypically distinct C. parvum subgroups, multilocus genotyping methods are needed to characterize C. parvum and C. hominis populations. Unless parasite virulence is controlled at the GP60 locus, attempts to find associations within species or subspecies between GP60 and phenotype are unlikely to be successful.

Indexed as

Genetic VariationCluster AnalysisCryptosporidiumDNA, ProtozoanGenotypeMolecular EpidemiologyMolecular Sequence DataParasitologySequence Analysis, DNADNA, Protozoan

Identifiers

PMID20709840
PMCPMC2950454
OpenAlexW2150106501

What OpenQuestion holds

Textmetadata
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.