Form of Stock Certificate of ContraFect Corporation [FRONT] Shares FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, $0.0001 PAR VALUE PER SHARE, OF CONTRAFECT CORPORATION Incorporated under the Laws of the State of Delaware CUSIP NO. AUTHORIZED COMMON STOCK: PAR VALUE: $0.0001 PER SHARE

Exhibit 4.1

Form of Stock Certificate of ContraFect Corporation

[FRONT]

                 Shares

FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, $0.0001 PAR VALUE PER SHARE, OF

CONTRAFECT CORPORATION

Incorporated under the Laws of the State of Delaware

CUSIP NO.                 

AUTHORIZED COMMON STOCK:                 

PAR VALUE: $0.0001 PER SHARE

This is to Certify that                  is the owner of                  fully paid and non-assessable shares of the above Corporation transferable only on the books of the Corporation by the holder hereof in person or by duly authorized Attorney upon surrender of this Certificate properly endorsed.

A statement of all of the rights, preferences, privileges and restrictions granted to or imposed upon the respective classes and/or series of shares of stock of the Corporation and upon the holders thereof may be obtained by any stockholder upon request and without charge, at the principal office of the Corporation, and the Corporation will furnish any stockholder, upon request and without charge, a copy of such statement.

Witness, the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

Dated:

COUNTERSIGNED AND REGISTERED:

AMERICAN STOCK TRANSFER & TRUST LLC,

TRANSFER AGENT AND REGISTRAR

[CONTRAFECT CORPORATION CORPORATE SEAL]

[BACK]

THE CORPORATION WILL FURNISH TO ANY STOCKHOLDER, UPON REQUEST AND WITHOUT CHARGE, A FULL STATEMENT OF THE DESIGNATIONS, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF THE SHARES OF EACH CLASS AND SERIES AUTHORIZED TO BE ISSUED, SO FAR AS THE SAME HAVE BEEN DETERMINED, AND OF THE AUTHORITY, IF ANY, OF THE BOARD OF DIRECTORS TO DIVIDE THE SHARES INTO CLASSES OR SERIES AND TO DETERMINE AND CHANGE THE RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF ANY CLASS OR SERIES. SUCH REQUEST MAY BE MADE TO THE SECRETARY OF THE CORPORATION OR TO THE TRANSFER AGENT NAMED ON THIS CERTIFICATE. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS, HER OR ITS LEGAL REPRESENTATIVES, TO GIVE THE CORPORATION A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM - as tenants in common

TEN ENT - as tenants by the entireties

JT TEN - as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MIN ACT- (Cust) Custodian - (Minor) under Uniform Gifts to Minors Act (State)

Additional abbreviations may also be used though not in the above list.

For value received,                                  hereby sell, assign and transfer unto                              Shares of the common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint                                  Attorney to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.

Dated,                     

NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.

SIGNATURE(S) GUARANTEED:

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.