Exhibit 99.2

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of Amendment No. 8 to the Schedule 13D originally filed on September 5, 2006 (including additional amendments thereto) with respect to the Common Stock of Rural/Metro Corporation.  This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: January 28, 2008

ACCIPITER LIFE SCIENCES FUND, LP
By:	Candens Capital, LLC its general partner
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

ACCIPITER LIFE SCIENCES FUND II, LP
By:	Candens Capital, LLC its general partner
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

ACCIPITER LIFE SCIENCES FUND II (QP), LP
By:	Candens Capital, LLC its general partner
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

ACCIPITER LIFE SCIENCES FUND (OFFSHORE), LTD.
By:	Accipiter Capital Management, LLC its investment manager
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

ACCIPITER LIFE SCIENCES FUND II (OFFSHORE), LTD.
By:	Accipiter Capital Management, LLC its investment manager
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

ACCIPITER CAPITAL MANAGEMENT, LLC
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

CANDENS CAPITAL, LLC
By:	/s/ Gabe Hoffman
	Gabe Hoffman, Managing Member

 /s/ Gabe Hoffman

GABE HOFFMAN