Exhibit 99.1 Immtech International, Inc. Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 --------------------------------------------------------------- In connection with the Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 on Form 10-Q of Immtech International, Inc. (the "Company") for the quarterly period ended December 31, 2002, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, T. Stephen Thompson, President and Chief Executive Officer of the Company, and Gary C. Parks, Treasurer, Secretary and Chief Financial Officer of the Company, do each hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: 1. such Quarterly Report on Form 10-Q for the quarter ended December 31, 2002 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 2. the information contained in such Quarterly Report on Form 10-Q for the quarter ended December 31, 2002 fairly presents, in all material respects, the financial condition and results of operations of the Company. /s/ T. Stephen Thompson --------------------------------------- T. Stephen Thompson President & Chief Executive Officer February 14, 2003 /s/ Gary C. Parks ---------------------------------------- Gary C. Parks Treasurer, Secretary and Chief Financial Officer (Principal Financial and Accounting Officer) February 14, 2003