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Updated: Aug 6, 2026
07:06
Prediction of HIV-1 Coreceptor Usage (Tropism) by Sequence Analysis using a Genotypic Approach
Published on: December 1, 2011
New cryptosporidium genotypes in HIV-infected persons
N J Pieniazek1, F J Bornay-Llinares, S B Slemenda
1Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA. nxp3@cdc.gov
Emerging Infectious Diseases
|May 26, 1999
Summary
Four Cryptosporidium genotypes were found in HIV-infected patients, including novel feline and canine strains. This study highlights the genetic diversity of Cryptosporidium in immunocompromised individuals.
Area of Science:
- Parasitology
- Infectious Diseases
- Genetics
Background:
- Cryptosporidium is an opportunistic parasite that causes significant gastrointestinal illness, particularly in immunocompromised individuals.
- Understanding the genetic diversity of Cryptosporidium is crucial for effective diagnosis, treatment, and public health interventions.
Purpose of the Study:
- To identify and characterize the genotypes of Cryptosporidium infecting human immunodeficiency virus (HIV)-infected patients.
- To determine the potential sources and transmission routes of Cryptosporidium infections in this vulnerable population.
Main Methods:
- DNA sequencing was employed to analyze Cryptosporidium isolates.
- Phylogenetic analysis was used to determine the genetic relationships between isolates and known Cryptosporidium genotypes.
Main Results:
- Four distinct Cryptosporidium genotypes were identified in HIV-infected patients.
- These included the common human (genotype 1) and bovine (genotype 2) Cryptosporidium parvum genotypes.
- Novel genotypes, identical to feline (C. felis) and canine (Cryptosporidium sp.) isolates, were also identified, marking the first report of human infection with these genotypes.
Conclusions:
- HIV-infected patients harbor a diverse range of Cryptosporidium genotypes, including zoonotic strains previously unassociated with human infections.
- The findings underscore the importance of considering a broader spectrum of Cryptosporidium genotypes in immunocompromised patients.
- Further research is needed to elucidate the clinical significance and transmission dynamics of these newly identified genotypes in humans.
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