Equis ISSN 2398-2977

Psoroptes spp

Contributor(s): Maggie Fisher, Sheelagh Lloyd, Rosanna Marsella

Introduction

Classification

Taxonomy

  • Phylum: Arthropoda.
  • Class: Arachnida.
  • Subclass: Acari.
  • Order: Astigmata.
  • Family: Psoroptidae.
  • Genus:Psoroptes.
  • Species:equi, cuniculi.

Active Forms

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Resting Forms

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Clinical Effects

Epidemiology

Lifecycle

  • Adult female lays eggs.
  • Larvae (approximately 330 µm) hatches - six legs.
  • Protonymph then tritonymph develop from larvae.
  • Female tritonymphs attach to males and remain attached until they moult to mature females.
  • Ratio of males to females is 1-2:4.
  • P. equilifecycle completed in about 3 weeks.

Transmission

  • Either direct contact with an infected animal or by transmission on fomites - mites can survive for some days in the environment.

Pathological effects

  • Non-burrowing mite - adults puncture the epidermis and feed on lymph and tissue fluid.
  • Cause scab formation, associated with hair loss   Tail: alopecia - psoroptic mange  and skin thickening.
  • Presence associated with pruritus.
  • May be foul smelling.
  • Pruritus, non-follicular papules, crusts, scales, excoriations, alopecia normally in angle of jaw, under mane and forelock, axilla and groin and outer ear.
  • P. cuniculilesions normally confined to ear.
  • Rarely lesions and mites may be found in other areas, eg face and limbs.
  • Can cause head shaking, irritation and exudate.

Control

Control via animal

  • Removal of crusts and exudate especially in ears.

Control via chemotherapies

  • Treatment with acaricide:
    • Otitis: rotenone twice per week for 3 weeks or thiabendazole.
    • Body mange: lime sulfur (2%) 6 oz/gallon of water once per week for 4 weeks or ivermectin   Ivermectin  200 µg/kg 1 time every other week 3 times.
  • Treat all animals in group (as others may be carriers).

Control via environment

  • Clean environment and grooming equipment.

Diagnosis

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Further Reading

Publications

Refereed papers


ADDED