Damage symptoms
Dermanyssus gallinae causes both direct and indirect damage in poultry houses:
- The loss of vitality due to parasitism reduces hens’ production; and
- The mite can transmit several viral diseases (Newcastle disease paramyxovirus; St. Louis encephalitis virus; the Eastern, Western, and Venezuelan equine encephalomyelitis viruses; avian influenza A virus; fowl pox virus) as well as bacterial infections (Escherichia coli, Erysipelothrix rhusiopathiae, Pasteurella multocida, Salmonella gallinarum and S. enteritidis).
Flocks with mite infestations can suffer from:
- visible skin irritation and lesions on the breast and legs;
- increased stress;
- altered sleep patterns;
- feather plucking;
- anemia, which presents as comb and wattle pallor; and
- death, in extreme cases.