Oocysts of Cryptosporidium from snakes are not infectious to ducklings but retain viability after intestinal passage through a refractory host

T. K. Graczyk, M. R. Cranfield, R. Fayer

Research output: Contribution to journalArticlepeer-review

Abstract

Six 2-week-old Cryptosporidium-free Peking ducklings (Anas platyrhynchos) each received 2.0 x 106 viable Cryptosporidium serpentis oocysts from 6 naturally infected captive snakes. Histological sections of digestive (stomach, jejunum, ileum, cloaca, and cecum) and respiratory tract tissues (larynx, trachea, and lungs) did not contain life-cycle stages of Cryptosporidium in any of the inoculated ducklings. Because ducklings were refractory to infection, C. serpentis transmission via a diet of Peking ducklings is improbable. Viable (per in vitro excystation assay) inoculum- derived oocysts were detected in duckling feces up to 7 days post-inoculation (PI); the number of intact oocysts excreted during the first 2 days PI was significantly higher than for the remaining 5 days PI (P < 0.01). The dynamics of oocyst shedding showed that overall the birds released a significantly higher number of intact oocysts than oocyst shells (P < 0.01). Retention of the viability of C. serpentis oocysts following intestinal passage through a refractory avian species may have epizootiological implications. Under certain circumstances such as after the ingestion of C. serpentis-infected prey, herpetivorous birds may disseminate C. serpentis oocysts in the environment.

Original languageEnglish (US)
Pages (from-to)33-40
Number of pages8
JournalVeterinary Parasitology
Volume77
Issue number1
DOIs
StatePublished - May 1998

Keywords

  • Cryptosporidium serpentis
  • Snake
  • Transmission

ASJC Scopus subject areas

  • Parasitology
  • veterinary(all)

Fingerprint Dive into the research topics of 'Oocysts of Cryptosporidium from snakes are not infectious to ducklings but retain viability after intestinal passage through a refractory host'. Together they form a unique fingerprint.

Cite this