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1.
    
    I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2006 of
Inhibitex, Inc.;2.
    
    Based on my knowledge, this report does not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements
were made, not misleading with respect to the period covered by this report;3.
    
    Based on my knowledge, the financial statements, and other financial information included in
this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the
registrant as of, and for, the periods presented in this report;4.
    
    The registrants other certifying officer(s) and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) for the registrant and
have:
 a)
    
    Designed such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material information relating
to the registrant is made known to us by others within those entities, particularly during
the period in which this report is being prepared;b)
    
    Designed such internal control over financial reporting, or caused such internal control
over financial reporting to be
designed under our supervision, to provide reasonable assurance regarding the reliability of
financial reporting and
the preparation of financial statements for external purposes in accordance with generally
accepted accounting principles;c)
    
    Evaluated the effectiveness of the registrants disclosure controls and procedures and
presented in this report our conclusions about the effectiveness of the disclosure controls
and procedures, as of the end of the period covered by this report based on such evaluation;
andd)
    
    Disclosed in this report any change in the registrants internal control over financial
reporting that occurred during the registrants most recent fiscal quarter (the registrants
fourth fiscal quarter in the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrants internal control over
financial reporting; and
 5.
    
    The registrants other certifying officer(s) and I have disclosed, based on our most recent
evaluation of internal control over financial reporting, to the registrants auditors and the
audit committee of the registrants board of
directors (or persons performing the equivalent functions):
 a)
    
    All significant deficiencies and material weaknesses in the design or operation of
internal control over financial reporting which are reasonably likely to adversely affect the
registrants ability to record, process, summarize and report financial information; andb)
    
    Any fraud, whether or not material, that involves management or other employees who have a
significant role in the registrants internal control over financial reporting.
  /s/ William D. JohnstonPresident and Chief Executive Officer