They have lobed nuclei and pale pink cytoplasm. They may be very numerous eg in purulent exudates, abscesses etc. . Sheets of densely packed neutrophils are present here in tissues removed from the mediastinum of a Springer Spaniel which had a foreign body within the thoracic cavity. This section was taken from the lungs of a cow with pneumonia. There is a dense infiltrate of cells including neutrophils within dilated airways.
Eosinophils often occur in hypersensitivity reactions and in association with parasitic infections.
This tissue was removed from a cat which developed a lump between the shoulder blades a few days following vaccination. There is a mixed cell infiltrate including many bright pink cells which are eosinophils. . . .