JOINT FILING AGREEMENT
Exhibit
3
In
accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
as
amended, each of the undersigned Reporting Persons hereby agrees to the joint
filing, along with all other such Reporting Persons, on behalf of each of
them
of a statement on Schedule 13G (including amendments thereto) with respect
to
the Common Stock of Quidel Corporation, and that this Agreement be included
as
an Exhibit to such joint filing. This Agreement may be executed in any number
of
counterparts, all of which taken together shall constitute one and the same
instrument.
IN
WITNESS WHEREOF, each of the undersigned hereby executes this Agreement as
of
this 10th day of May, 2007.
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By:
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X.
X. Xxxx & Co., L.L.C., as
managing
member
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By:
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/s/ Xxxx
Xxxxxxx
Xxxx
Xxxxxxx
Managing
Director
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D.
E. Shaw Composite Portfolios, L.L.C.
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By:
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X.
X. Xxxx & Co., L.L.C., as
managing
member
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By:
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/s/ Xxxx
Xxxxxxx
Xxxx
Xxxxxxx
Managing
Director
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| X. X. Xxxx & Co., L.L.C. | ||
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| By: | /s/ Xxxx Xxxxxxx | |
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Xxxx
Xxxxxxx
Managing
Director
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| X. X. Xxxx & Co., L.P. | ||
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| By: | /s/ Xxxx Xxxxxxx | |
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Xxxx
Xxxxxxx
Managing
Director
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| Xxxxx X. Xxxx | ||
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| By: | /s/ Xxxx Xxxxxxx | |
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Xxxx
Xxxxxxx
Attorney-in-Fact
for Xxxxx X. Xxxx
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