i contracted west nile while on the job .can i sue company for not providing some kind of repellent protection.

I really need more facts to give you an accurate take.  Your rights will depend on the nature and extent of your west nile related illness and limitations, the nature of your employment, the location of your job where you contracted the virus, and your work history with that employer. You should contact a personal injury/workers' compensation lawyer in your area.   Good luck. Michael Barras