o
|
Rule
13d-1(b)
|
x
|
Rule
13d-1(c)
|
o
|
Rule
13d-1(d)
|
CUSIP
No. 74838J101
|
|||||
1.
|
Names
of Reporting Persons
I.R.S.
Identification Nos. of above persons (entities only)
D.
E. Shaw Meniscus Portfolios, L.L.C.
51-0481096
|
||||
2.
|
Check
the Appropriate Box if a Member of a Group (See Instructions)
|
||||
(a)
|
o
|
||||
(b)
|
o
|
||||
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
-0-
|
||||
7.
|
Sole
Dispositive Power
-0-
|
||||
8.
|
Shared
Dispositive Power
-0-
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
-0-
|
||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) o
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
0.0%
|
||||
12.
|
Type
of Reporting Person (See Instructions)
OO
|
CUSIP
No. 74838J101
|
||||||
1.
|
Names
of Reporting Persons
I.R.S.
Identification Nos. of above persons (entities only)
D.
E. Shaw Composite Portfolios, L.L.C.
13-4152438
|
|||||
2.
|
Check
the Appropriate Box if a Member of a Group (See Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
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
1,861,468
|
|||||
7.
|
Sole
Dispositive Power
-0-
|
|||||
8.
|
Shared
Dispositive Power
1,861,468
|
|||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
1,861,468
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) o
|
|||||
11.
|
Percent
of Class Represented by Amount in Row (9)
5.6%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
OO
|
CUSIP
No. 74838J101
|
|||||
1.
|
Names
of Reporting Persons
I.R.S.
Identification Nos. of above persons (entities only)
D.
E. Shaw & Co., L.L.C.
13-3799946
|
||||
2.
|
Check
the Appropriate Box if a Member of a Group (See Instructions)
|
||||
(a)
|
o
|
||||
(b)
|
o
|
||||
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
1,861,468
|
||||
7.
|
Sole
Dispositive Power
-0-
|
||||
8.
|
Shared
Dispositive Power
1,861,468
|
||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
1,861,468
|
||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) o
|
||||
11.
|
Percent
of Class Represented by Amount in Row (9)
5.6%
|
||||
12.
|
Type
of Reporting Person (See Instructions)
OO
|
CUSIP
No. 74838J101
|
||||||
1.
|
Names
of Reporting Persons
I.R.S.
Identification Nos. of above persons (entities only)
D.
E. Shaw & Co., L.P.
13-3695715
|
|||||
2.
|
Check
the Appropriate Box if a Member of a Group (See Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
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
2,020,467
|
|||||
7.
|
Sole
Dispositive Power
-0-
|
|||||
8.
|
Shared
Dispositive Power
2,020,467
|
|||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
2,020,467
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) o
|
|||||
11.
|
Percent
of Class Represented by Amount in Row (9)
6.1%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
IA,
PN
|
CUSIP
No. 74838J101
|
||||||
1.
|
Names
of Reporting Persons
I.R.S.
Identification Nos. of above persons (entities only)
David
E. Shaw
|
|||||
2.
|
Check
the Appropriate Box if a Member of a Group (See Instructions)
|
|||||
(a)
|
o
|
|||||
(b)
|
o
|
|||||
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
2,020,467
|
|||||
7.
|
Sole
Dispositive Power
-0-
|
|||||
8.
|
Shared
Dispositive Power
2,020,467
|
|||||
9.
|
Aggregate
Amount Beneficially Owned by Each Reporting Person
2,020,467
|
|||||
10.
|
Check
if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) o
|
|||||
11.
|
Percent
of Class Represented by Amount in Row (9)
6.1%
|
|||||
12.
|
Type
of Reporting Person (See Instructions)
IN
|
Item
1.
|
(a)
|
Name
of Issuer
|
||
Quidel
Corporation
|
|||
|
|||
(b)
|
Address
of Issuer's Principal Executive Offices
|
||
10165
McKellar Court
San
Diego, CA
92121
|
Item
2.
|
(a)
|
Name
of Person Filing
|
||
D.
E. Shaw Meniscus Portfolios, L.L.C.
D.
E. Shaw Composite Portfolios, L.L.C.
D.
E. Shaw & Co., L.L.C.
D.
E. Shaw & Co., L.P.
David
E. Shaw
|
|||
(b)
|
Address
of Principal Business Office or, if none,
Residence
|
||
The
business address for each reporting person is:
120
W. 45th
Street, Tower 45, 39th
Floor
New
York, NY 10036
|
|||
(c)
|
Citizenship
|
||
D.
E. Shaw Meniscus Portfolios, L.L.C. is a limited liability company
organized under the laws of the state of Delaware.
D.
E. Shaw Composite Portfolios, L.L.C. is a limited liability company
organized under the laws of the state of Delaware.
D.
E. Shaw & Co., L.L.C. is a limited liability company organized under
the laws of the state of Delaware.
D.
E. Shaw & Co., L.P. is a limited partnership organized under the laws
of the state of Delaware.
David
E. Shaw is a citizen of the United States of America.
|
|||
(d)
|
Title
of Class of Securities
|
||
Common
Stock
|
|||
(e)
|
CUSIP
Number
|
||
74838J101
|
Item
4. Ownership
|
|
As
of May 3, 2007:
|
|
(a)
Amount beneficially owned:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
-0- shares
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
1,861,468 shares |
D.
E. Shaw & Co., L.L.C.:
|
1,861,468
shares
This
is composed of 1,861,468 shares in the name of
D. E. Shaw
Composite Portfolios, L.L.C.
|
D.
E. Shaw & Co., L.P.:
|
2,020,467
shares
This
is composed of (i) 1,861,468 shares in the name of
D. E. Shaw
Composite Portfolios, L.L.C., (ii) 104,299 shares in
the name of
D. E. Shaw Valence Portfolios, L.L.C., (iii) 52,500 shares
in
the name of D. E. Shaw Valence, L.L.C., and (iv) 2,200 shares
under the management of D. E. Shaw Investment Management,
L.L.C.
|
David
E. Shaw:
|
2,020,467
shares
This
is composed of (i) 1,861,468 shares in the name of D. E. Shaw
Composite Portfolios, L.L.C., (ii) 104,299 shares in the
name of
D. E. Shaw Valence Portfolios, L.L.C., (iii) 52,500 shares in
the name of D. E. Shaw Valence, L.L.C., and (iv) 2,200 shares
under the management of D. E. Shaw Investment Management,
L.L.C.
|
(b)
Percent of class:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
0.0%
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
5.6%
|
D.
E. Shaw & Co., L.L.C.:
|
5.6%
|
D.
E. Shaw & Co., L.P.:
|
6.1%
|
David
E. Shaw:
|
6.1%
|
(c)
Number of shares to which the person has:
|
||
(i)
|
Sole
power to vote or to direct the vote:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw & Co., L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw & Co., L.P.:
|
-0-
shares
|
|
David
E. Shaw:
|
-0-
shares
|
|
(ii)
|
Shared
power to vote or to direct the vote:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
1,861,468
shares
|
|
D.
E. Shaw & Co., L.L.C.:
|
1,861,468
shares
|
|
D.
E. Shaw & Co., L.P.:
|
2,020,467
shares
|
|
David
E. Shaw:
|
2,020,467
shares
|
|
(iii)
|
Sole
power to dispose or to direct the disposition of:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw & Co., L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw & Co., L.P.:
|
-0-
shares
|
|
David
E. Shaw:
|
-0-
shares
|
|
(iv)
|
Shared
power to dispose or to direct the disposition of:
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.:
|
-0-
shares
|
|
D.
E. Shaw Composite Portfolios, L.L.C.:
|
1,861,468
shares
|
|
D.
E. Shaw & Co., L.L.C.:
|
1,861,468
shares
|
|
D.
E. Shaw & Co., L.P.:
|
2,020,467
shares
|
|
David
E. Shaw:
|
2,020,467
shares
|
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 person has ceased to be the beneficial owner
of more
than 5 percent of the class of securities, check the following
x
As
of the date hereof, D. E. Shaw Meniscus Portfolios, L.L.C. has
ceased to be the beneficial owner of more than 5 percent of the
class of
securities.
|
||
Item
6.
|
Ownership
of More than Five Percent on Behalf of Another Person.
|
|
Not
Applicable
|
||
Item
7.
|
Identification
and Classification of the Subsidiary Which Acquired the Security
Being
Reported on By the Parent Holding Company or Control Person.
|
|
Not
Applicable
|
Item
8.
|
Identification
and Classification of Members of the Group
|
||
Not
Applicable
|
|||
Item
9.
|
Notice
of Dissolution of Group
|
||
Not
Applicable
|
|||
Item
10.
|
Certification
|
|
D.
E. Shaw Meniscus Portfolios, L.L.C.
|
||
|
By:
|
D.
E. Shaw & Co., L.L.C., as
managing
member
|
|
|
|
|
|
|
|
By:
|
/s/ Anne
Dinning
Anne
Dinning
Managing
Director
|
|
D.
E. Shaw Composite Porfolios, L.L.C.
|
||
|
By:
|
D.
E. Shaw & Co., L.L.C., as
managing
member
|
|
|
|
|
|
|
|
By:
|
/s/ Anne
Dinning
Anne
Dinning
Managing
Director
|
D. E. Shaw & Co., L.L.C. | ||
|
|
|
By: | /s/ Anne Dinning | |
Anne
Dinning
Managing
Director
|
D. E. Shaw & Co., L.P. | ||
|
|
|
By: | /s/ Anne Dinning | |
Anne
Dinning
Managing
Director
|
David E. Shaw | ||
|
|
|
By: | /s/ Anne Dinning | |
Anne
Dinning
Attorney-in-Fact
for David E.
Shaw
|