The present disclosure provides a method of detecting the presence of a hypnozoite stage of Plasmodium vivax in a liver cell. In addition, the present disclosure provides compositions and methods of detecting the presence of a latent Plasmodium vivax infection in a subject and for treating the subject detected to be infected.

Disclosed are neoglycoconjugates and/or glycosides containing glycan selected from Galpα1,3Galfβ, Galpα1,6Galpα1,3Galfβ, or Galpα1,3Galfβ1,3Manpα. Methods of using the glycosides and/or neoglycoconjugates as diagnostic or prognostic biomarkers, vaccines, treating or detecting parasitic diseases, such as cutaneous leishmaniasis are disclosed.

Velvet disease infestation is detected using affinity reagents that are cross-reactive with one or more A. ocellatum or P. pillulare antigens. The analysis may be performed shipboard, dockside, in an aquaculture or aquarium setting, otherwise in situ at the point of sample collection or elsewhere. The results may be used to monitor health and disease of captured or cultured fish species or the safety of water to be introduced into an aquaculture facility.

Described herein are compositions that comprise one or more Babesia microti antigens, one or more Babesia microti nucleic acid molecules, or one or more anti-Babesia microti antibodies and uses thereof in methods for the prophylaxis of babesiosis, the treatment of babesiosis and the monitoring of individuals undergoing prophylactic or therapeutic administration of the compositions of the invention.

Described herein are compositions that comprise one or more Babesia microti antigens, one or more Babesia microti nucleic acid molecules, or one or more anti-Babesia microti antibodies and uses thereof in methods for the prophylaxis of babesiosis, the treatment of babesiosis and the monitoring of individuals undergoing prophylactic or therapeutic administration of the compositions of the invention.

In the present invention, inventors report the characterization of BCLA (Brain Cyst Load-associated Antigen), a protein exclusively expressed during the bradyzoite stage of the parasite. In cysts directly purified from the brain of mice, the protein is distributed within and at the surface of the cyst. ELISA antibody capture using a combination of serologically reactive BCLA peptides and a recombinantly expressed c-terminal domain (rBCLA) constitutes an efficient serological marker of latent infection with a high sensitivity that is clearly and exclusively correlated with the presence of cysts in the brain of mice Antibodies directed against BCLA antigen have been detected in human patients with enriched titers in patients qualified as seropositive to Sag1 or tachyzoite related antigens. Further correlation in humans between anti-BCLA IgG synthesis and cysts is brought by significantly stronger recorded titers in pathological panels strongly related to the presence of cyst. Furthermore, newborn infants with a confirmed congenital toxoplasmosis display significantly higher anti-BCLA IgGs at birth when compared to their mother, suggesting a specific in-utero neosynthesis of such IgGs. Thus the invention relates to a new Toxoplasma gondii protein, hereafter referred as BCLA, a new serological marker whose expression is restricted to the latent form of Toxoplasmosis (bradyzoite/cyst). This specific protein and its antigenic fragments can be used to detect autoantibodies in the sera of patient for the diagnosis of the latent form of Toxoplasmosis. The invention also relates to derived antibodies, generated by BCLA immunisation that specifically binds this new protein.

The present invention relates to: a composition for differentially diagnosing Acanthamoeba keratitis, the composition comprising chorismate mutase antibodies; and an Acanthamoeba keratitis diagnosis kit using same. The composition comprising chorismate mutase antibodies according to the present invention causes an antigen-antibody reaction only specific to a chorismate mutase protein secreted from Acanthamoeba, thus making it possible to diagnose Acanthamoeba keratitis and differentiate the cause of Acanthamoeba keratitis more rapidly and accurately than existing methods for diagnosing Acanthamoeba keratitis. The composition is expected to be widely applicable to the production of Acanthamoeba keratitis diagnosis kits, therapeutic agents, contact lens disinfecting agents, and the like using the composition.

The disclosure, in some aspects, provides a composition comprising labelled and/or tagged and/or bound amino acid sequences useful for the detection of Babesia species. Also disclosed are methods for the detection of infection by one or more Babesia species.

The present invention describes methods of identifying high-risk populations or individuals who have positive serology for T. gondii. These methods include obtaining a biological sample from a subject; determining the level of T. gondii cyst antigen antibody in the biological sample; and characterizing the biological sample in at least one of three categories.

Disclosed herein are compositions and methods for detecting antibodies directed to epitopes of the metabolic enzymes, fructose-1,6-bisphosphate aldolase (A), α-enolase (E), and glyceraldehyde-3-phosphate dehydrogenase (G), that are shared between T. vaginalis and human AEG proteins.