FORM 3
        	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

Moore Carol	2. Date of Event Requiring Statement (MM/DD/YYYY)
4/18/2013 
	3. Issuer Name and Ticker or Trading Symbol

CERUS CORP [CERS]	
(Last)        (First)        (Middle)

C/O CERUS CORPORATION, 2550 STANWELL DRIVE	4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
SR. V.P. Regulatory, Clinical /	
(Street)

CONCORD, CA 94520       

(City)              (State)              (Zip)	5. If Amendment, Date Original Filed (MM/DD/YYYY)

	6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Beneficially Owned	
1.Title of Security
(Instr. 4)	2. Amount of Securities Beneficially Owned
(Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)	4. Nature of Indirect Beneficial Ownership
(Instr. 5)	
Common Stock  	3074  	D  	 	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 4)	2. Date Exercisable and Expiration Date
(MM/DD/YYYY)	3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)	6. Nature of Indirect Beneficial Ownership
(Instr. 5)	
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares				
Option (Right to Buy)  	  (1)	3/31/2018  	Common Stock  	100000  	$5.77  	D  	 	
Option (Right to Buy)  	  (1)	9/30/2018  	Common Stock  	20000  	$4.19  	D  	 	
Option (Right to Buy)  	  (1)	1/11/2019  	Common Stock  	75000  	$0.79  	D  	 	
Option (Right to Buy)  	  (2)	9/30/2019  	Common Stock  	30000  	$2.15  	D  	 	
Option (Right to Buy)  	  (3)	8/31/2020  	Common Stock  	60000  	$3.00  	D  	 	
Option (Right to Buy)  	  (1)	1/2/2021  	Common Stock  	25  	$2.48  	D  	 	
Option (Right to Buy)  	  (4)	8/31/2021  	Common Stock  	130000  	$2.08  	D  	 	
Option (Right to Buy)  	  (5)	2/28/2022  	Common Stock  	110000  	$3.75  	D  	 	
Option (Right to Buy)  	  (6)	2/28/2023  	Common Stock  	170000  	$3.66  	D  	 	

Explanation of Responses:	
(  1) 	Fully vested.	
(  2) 	One eighth (1/8th) of the shares subject to the Option vested on April 1, 2010 and one forty-eighth (1/48th) of the shares subject to the Option vested or will vest monthly thereafter.	
(  3) 	One eighth (1/8th) of the shares subject to the Option vested on March 1, 2011 and one forty-eighth (1/48th) of the shares subject to the Option vested or will vest monthly thereafter.	
(  4) 	One eighth (1/8th) of the shares subject to the Option vested on March 1, 2012 and one forty-eighth (1/48th) of the shares subject to the Option vested or will vest monthly thereafter.	
(  5) 	One eighth (1/8th) of the shares subject to the Option vested on September 1, 2012 and one forty-eighth (1/48th) of the shares subject to the Option vested or will vest monthly thereafter.	
(  6) 	One eighth (1/8th) of the shares subject to the Option will vest on September 1, 2013 and one forty-eighth (1/48th) of the shares subject to the Option will vest monthly thereafter.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
Moore Carol
C/O CERUS CORPORATION
2550 STANWELL DRIVE
CONCORD, CA 94520			SR. V.P. Regulatory, Clinical		

Signatures		
Carol M. Moore by Chrystal Menard, attorney-in-fact		4/23/2013	
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.