Exposure of pelagic seabirds to Toxoplasma gondii in the Western Indian Ocean points to an open sea dispersal of this terrestrial parasite

PLoS One. 2021 Aug 18;16(8):e0255664. doi: 10.1371/journal.pone.0255664. eCollection 2021.

Abstract

Toxoplasma gondii is a protozoan parasite that uses felids as definitive hosts and warm-blooded animals as intermediate hosts. While the dispersal of T. gondii infectious oocysts from land to coastal waters has been well documented, transmission routes to pelagic species remain puzzling. We used the modified agglutination test (MAT titre ≥ 10) to detect antibodies against T. gondii in sera collected from 1014 pelagic seabirds belonging to 10 species. Sampling was carried out on eight islands of the Western Indian Ocean: Reunion and Juan de Nova (colonized by cats), Cousin, Cousine, Aride, Bird, Europa and Tromelin islands (cat-free). Antibodies against T. gondii were found in all islands and all species but the great frigatebird. The overall seroprevalence was 16.8% [95% CI: 14.5%-19.1%] but significantly varied according to species, islands and age-classes. The low antibody levels (MAT titres = 10 or 25) detected in one shearwater and three red-footed booby chicks most likely resulted from maternal antibody transfer. In adults, exposure to soils contaminated by locally deposited oocysts may explain the detection of antibodies in both wedge-tailed shearwaters on Reunion Island and sooty terns on Juan de Nova. However, 144 adults breeding on cat-free islands also tested positive. In the Seychelles, there was a significant decrease in T. gondii prevalence associated with greater distances to cat populations for species that sometimes rest on the shore, i.e. terns and noddies. This suggests that oocysts carried by marine currents could be deposited on shore tens of kilometres from their initial deposition point and that the number of deposited oocysts decreases with distance from the nearest cat population. The consumption of fishes from the families Mullidae, Carangidae, Clupeidae and Engraulidae, previously described as T. gondii oocyst-carriers (i.e. paratenic hosts), could also explain the exposure of terns, noddies, boobies and tropicbirds to T. gondii. Our detection of antibodies against T. gondii in seabirds that fish in the high sea, have no contact with locally contaminated soils but frequent the shores and/or consume paratenic hosts supports the hypothesis of an open-sea dispersal of T. gondii oocysts by oceanic currents and/or fish.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Agglutination Tests
  • Animals
  • Antibodies, Protozoan / blood
  • Antibodies, Protozoan / immunology
  • Chickens / blood
  • Chickens / parasitology*
  • Environmental Pollution
  • Indian Ocean / epidemiology
  • Indian Ocean Islands / epidemiology
  • Oocysts
  • Parasites / immunology*
  • Poultry Diseases / blood
  • Poultry Diseases / epidemiology*
  • Poultry Diseases / parasitology
  • Prevalence
  • Seroepidemiologic Studies
  • Soil / parasitology
  • Toxoplasma / immunology*
  • Toxoplasmosis, Animal / blood
  • Toxoplasmosis, Animal / epidemiology*
  • Toxoplasmosis, Animal / parasitology
  • Zoonoses / blood
  • Zoonoses / epidemiology*
  • Zoonoses / parasitology

Substances

  • Antibodies, Protozoan
  • Soil

Grants and funding

CLe was supported by a "Chaire Mixte Institut National de la Santé et de la Recherche Médicale (INSERM) – Université de La Réunion". The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.