JOINT FILING AGREEMENT
EXHIBIT
4
In
accordance with Rule 13d-1(k) under
the Securities Exchange Act of 1934, as amended, each of the persons named
below
agrees to the joint filing of a Statement on Schedule 13D (including amendments
thereto) with respect to the common stock, $0.01 par value per share (including
the associated preferred stock purchase rights), of MedImmune, Inc., a Delaware
corporation, and further agrees that this Joint Filing Agreement be included
as
an exhibit to such filings provided that, as contemplated by Section
13d-1(k)(ii), no person shall be responsible for the completeness or accuracy
of
the information concerning the other persons making the filing, unless such
person knows or has reason to believe that such information is
inaccurate. This Joint Filing Agreement may be executed in any number
of counterparts, all of which together shall constitute one and the same
instrument.
Dated
as
of June 13, 2007
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ASTRAZENECA
BIOPHARMACEUTICALS INC.
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By:
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/s/ Xxxxx X. X. Xxxxx | ||
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Name: Xxxxx
X. X. Xxxxx
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Title: Assistant
Secretary and Vice President
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