**2.3 Predisposing factors for ANCA-associated vasculitis**

	- Pesticides, asbestos, smoke and silica.
	- A number of therapeutic agents are responsible for drug-induced AAV such as propylthiouracil, benzylthio-uracil and hydralazine **…** [5]**.**
	- Chronic carriage of staphylococcus aureus which is reported to be a risk factor for relapse in GPA.
