Neotrombicula spp

From Dog
Neotrombicula autumnalis larva[1]

Neotrombicula spp (harvest mites) are an uncommon parasitic mites of dogs.

Neotrombicula are an arthropod usually living in the soil, except for the short period of the larval stage when it becomes a real parasite of warm-blooded hosts[2]. Larval stages are extremely euryoecious (meaning tolerating very different environmental conditions)[3].

Species which are pathogenic to dogs include:

  • Neotrombicula autumnalis
  • Neotrombicula carpathica
  • Neotrombicula inopinata[4]

Infestations are usually acquired in rural settings. They remain on the skin for a few days unless dislodged by the dog while scratching. Infected dogs usually show intense pruritus. Similar symptoms are seen with Straelensia spp larval mites.

Dogs have been experimentaly infected with larvae and clinical symptoms appeared, including hindlimb paresis. Neurological signs resolved after treatment with acaricidal drugs[5].

Larval stages can be infected with Borrelia spp and Ehrlichia phagocytophila through transovarial transmission and may transmit to dogs during feeding[6].

References

  1. Biolib.cz
  2. Guarneri F et al (2005) Trombiculiasis: clinical contribution. Eur J Dermatol 15(6):495-496
  3. Schöler A et al (2006) Multiple environmental factor analysis in habitats of the harvest mite Neotrombicula autumnalis (Acari: Trombiculidae) suggests extraordinarily high euryoecious biology. Exp Appl Acarol 39(1):41-62
  4. Literak I et al (2008) Larvae of chigger mites Neotrombicula spp. (Acari: Trombiculidae) exhibited Borrelia but no Anaplasma infections: a field study including birds from the Czech Carpathians as hosts of chiggers. Exp Appl Acarol 44(4):307-314
  5. Bowman, DD (2009) Georgis' parasitology for veterinarians. 9th edn. Elsevier Saunders, Missouri. pp:74
  6. Fernández-Soto P et al (2001) Molecular detection of Ehrlichia phagocytophila genogroup organisms in larvae of Neotrombicula autumnalis (Acari: Trombiculidae) captured in Spain. J Parasitol 87(6):1482-1483