Vascular and cellular response to phytohaemagglutinin in Japanese quail

Intradermal inoculation of 100 mu g phytohaemagglutinin (PHA) in Japanese q uail caused a mild increase in vascular permeability which persisted up to 1 hr post-inoculation (PI). Histologically, a cellular infiltrate rich in h eterophils, monocytes and basophils observed during early hours was soon fo llowed by predominant T-lymphocytes accumulation around many small blood ve ssels forming well developed lymphoid aggregates at 24-48 hr PI.