(Hairy caterpillars)

These are mainly Thaumetopoea pityocampa schif. pine processionary moth, Thaumetopoea processionea 1. oak processionary moth, Euproctis chrysorrhoea brown-tail moth, Euproctis similis yellow-tail moth, gold-tail moth.


[affected.gif] Animals most affected
Dogs, horses, pigs, (all animals).


[etiology.gif] Etiology
The caterpillars infest pastures and fields. Animals may be affected by:

Incidences occur predominantly in spring (March-3une), when the caterpillars leave their communal nests to feed.


[toxic.gif] Toxicity
Only the larvae at stages 3-5 are involved. Adverse effects occur due to the histamine-releasing proteins (thaumetopoein in the case of the pine processionary moth) and other allergenic compounds. Thaumetopoein is contained in the hairs which act as fine needles through which the toxic compounds are injected.
Toxic doses not known.



[clinical.gif] Clinical features and lesions
Occur mainly in the buccal and perioral areas:

Occasional general reactions may develop:

Following inhalation:

Local dermal reactions:

The following have also been observed:

[treatm~1.gif] Treatment
No antidote. Symptomatic care only.