SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                (RULE 13d - 102)

      INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b),
            (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d

                               (Amendment No. 2)*
Healthcare Acquisition Corp.
(Name of Issuer)

Common Stock
(Title of Class of Securities)

42224H104
(CUSIP Number)

June 9, 2006
(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ]      Rule 13d-1(b)
[x]      Rule 13d-1(c)
[ ]      Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



1.      NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                Amaranth LLC

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                (a) [ ]
                (b) [x]

3.      SEC USE ONLY

4.      CITIZENSHIP OR PLACE OF ORGANIZATION

                Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.      SOLE VOTING POWER

                0

6.      SHARED VOTING POWER

                470,200

7.      SOLE DISPOSITIVE POWER

                0

8.      SHARED DISPOSITIVE POWER

                470,200

9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                See 6 and 8 above.

10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES*   [  ]

11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                4.0%

12.     TYPE OF REPORTING PERSON*

                CO





1.      NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                Amaranth Advisors L.L.C.

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                (a) [ ]
                (b) [x]

3.      SEC USE ONLY

4.      CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.      SOLE VOTING POWER

                0

6.      SHARED VOTING POWER

                470,200

7.      SOLE DISPOSITIVE POWER

                0

8.      SHARED DISPOSITIVE POWER

                470,200

9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                See 6 and 8 above.

10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES* [  ]

11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                4.0%

12.     TYPE OF REPORTING PERSON*

                IA





1.      NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                Nicholas M. Maounis

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                (a) [ ]
                (b) [x]

3.      SEC USE ONLY

4.      CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5.      SOLE VOTING POWER

                0

6.      SHARED VOTING POWER

                470,200

7.      SOLE DISPOSITIVE POWER

                0

8.      SHARED DISPOSITIVE POWER

                470,200

9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                See 6 and 8 above.

10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES* [  ]

11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                4.0%

12.     TYPE OF REPORTING PERSON*

                IN, HC


This  statement  is filed with  respect to the  shares of common  stock,  having
$.0001 par value (the  "Common  Stock") of  Healthcare  Acquisition  Corp.  (the
"Issuer") beneficially owned by Amaranth LLC, a Cayman Islands exempted company,
Amaranth Advisors L.L.C. and Nicholas M. Maounis  (collectively,  the "Reporting
Persons") as of July 13, 2006 and amends and  supplements the Schedule 13G filed
October 27, 2005,  as previously  amended  (collectively,  the "Schedule  13G").
Except as set forth herein, the Schedule 13G is unmodified.

Item 4.    Ownership.

     Provide  the  following  information  regarding  the  aggregate  number and
percentage of the class of securities of the issuer identified in Item 1.

(a)  Amount beneficially owned:

        470,200

(b)  Percent of class:

        4.0%

(c)  Number of shares as to which such person has:

        (i) Sole power to vote or direct the vote

                0

       (ii) Shared power to vote or to direct the vote

                See Item 4(a).

      (iii) Sole power to dispose or to direct the disposition of

                0

       (iv) Shared power to dispose or to direct the disposition of

                See Item 4(a).


Item 5.   Ownership of Five Percent or Less of a Class.

If this  statement  is being filed to report the fact that as of the date hereof
the Reporting  Persons have ceased to be the beneficial  owner of more than five
percent of the class of securities, check the following [X].




Item 10.  Certification.

By signing below the  undersigned  certifies  that, to the best of its knowledge
and belief, the securities  referred to above were not acquired and are not held
for the purpose of or with the effect of changing or influencing  the control of
the  issuer  of the  securities  and  were  not  acquired  and are  not  held in
connection  with or as a participant in any  transaction  having that purpose or
effect.






                                   SIGNATURES

     After reasonable inquiry and to the best of its knowledge and belief,  each
of the undersigned  certifies that the information  with respect to it set forth
in this statement is true, complete, and correct.


Dated:   July 13, 2006

         AMARANTH LLC
            by Amaranth Advisors L.L.C., as Trading Advisor

            By: /s/  Nicholas M. Maounis, Managing Member
                ------------------------------------------------
                     Nicholas M. Maounis, Managing Member


         AMARANTH ADVISORS L.L.C.

            By: /s/  Nicholas M. Maounis, Managing Member
                ------------------------------------------------
                     Nicholas M. Maounis, Managing Member


          NICHOLAS M. MAOUNIS

                /s/  Nicholas M. Maounis
                ------------------------------------------------
                     Nicholas M. Maounis