SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No.)*

                                     NABI US
                        --------------------------------------------
                                (Name of Issuer)

                                  Common stock
                        --------------------------------------------
                         (Title of Class of Securities)

                                    628716102
                                 -------------------------
                                 (CUSIP Number)



Check the following  box if a fee is being paid with this  statement [ ]. (A fee
is not required only if the filing person:  (1) has a previous statement on file
reporting  beneficial  ownership of more than 5 percent of the class  securities
described in Item 1; and (2) has filed no amendment subsequent thereto reporting
beneficial ownership of five percent or less of such class.) (See Rule 13d-7.)

* The  remainder  of the cover page shall be filled out for a reporting  persons
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934
(Act) or  otherwise  subject to the  liabilities  of that section of the Act but
shall be subject to all other provisions of the act (however, see the Notes).

                              (Continued on following page(s))
                                Page 1 of 5 Pages
- -----------------------------------------------------------------------------


CUSIP No. 628716102 13G Page 2 of 5 Pages - ----------------------------------------------------------------------- - ------------------------------------------------------------------------------ 1. NAME OF REPORTING PERSON - -------------------------------------------------------------------------- S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Loomis Sayles & Co., L.P. #04-3200030 - ------------------------------------------------------------------------------ 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - ------------------------------------------------------------------------------ - -------------------------------------------------------------------------- 3. SEC USE ONLY - ---------------------------------------------------------------------------- - ------------------------------------------------------------------------------ - ----------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION - ----------------------------------------------------------------------------- Reporting Person: Citizenship or place of organization of Delaware laws. Principal office of Reporting Person is in Boston, MA. - ------------------------------------------------------------------------------ 5. SOLE VOTING POWER 121,939 NUMBER OF SHARES 6. SHARED VOTING POWER BENEFICIALLY -0- OWNED BY EACH REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH 2,043,929 8. SHARED DISPOSITIVE POWER -0- - ------------------------------------------------------------------------------ 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,043,929 - ------------------------------------------------------------------------------ 10. CHECK BOX IF AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* - ------------------------------------------------------------------------------ 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.37% - ------------------------------------------------------------------------------ 12. TYPE OF REPORTING PERSON* Investment adviser *SEE INSTRUCTIONS BEFORE FILLING OUT -2-

SCHEDULE G Item 1(a). Name of Issuer NABI US Item 1(b). Address of Issuers Principal Office 5800 Park of Commerce Blvd NW STE 322 Boca Raton, FL 33487 Item 2(a). Name of Person Filing Loomis, Sayles & Co., L.P. Item 2(b). Address of Principal Business Office One Financial Center Boston, MA 02111 Item 2(c). Citizenship Reporting Person: Citizenship or place of organization of Delaware laws. Principal office of Reporting Person is Boston, MA Item 2(d). Title of Class of Securities Common Stock Item 2(e). CUSIP Number 628716102 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: (a) [ ] Broker or dealer registered under Section 15 of the Act (b) [ ] Bank as defined in Section 3(a)(6) of the Act (c) [ ] Insurance Company registered under Section 3(a)(19) of the Act (d) [ ] Investment company registered under Section 8 of the Investment Company Act (e) [x] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940 (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund: see Section 240.13d-1(b)(1)(ii)(F) (g) [ ] Parent Holding Company, in accordance with Section 240. 13d- 1(b)(ii)(G) (Note: See Item 7) (h) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(H) -3- SCHEDULE G Item 4. Ownership If the percent of the class owned, as of December 31 of the year covered by the statement, or as of the last day of any month described in Rule 13d-1(b)(2), if applicable, exceeds 5 percent, provide the following information as of that date and identify those shares which there is a right to acquire. (a) Amount beneficially owned: 2,043,929 (b) Percent of Class: 5.37% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 121,939 (ii) shared power to vote or to direct the vote: -0- (iii) sole power to dispose or to direct the disposition of: 2,043,929 (iv) shared power to dispose or direct the disposition of: -0- Loomis, Sayles & Company, L.P. disclaims any beneficial interest in any of the foregoing securities. 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 five percent of the class of securities, check the following [ ]. Item 6. Ownership of More than Five Percent on Behalf of Another Person. -------------------------------------------------- If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of an employee benefit plan, pension fund or endowment fund is not required. Clients of Reporting Person have such a right, none of whom has such interest relating to more than 5% of any class. -4- SCHEDULE G Item 7. Identification and Classification of the Subsidiary Which Acquired ---------------------------------------------------- the Security Being Reported on By the Parent Holding Company - --- -------------------------------------------------------- If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c), attach an exhibit stating the identification of the relevant subsidiary. Inapplicable Item 8. Identification and Classification of Members of the Group. --------------------------------------------------- If a group has filed this schedule pursuant to Rule 13d-1(b)(ii)(H), so indicate under Item 3(b) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to Rule 13d-1(c), attach an exhibit stating the identity of each member of the group. Inapplicable Item 9. Notice of Dissolution of Group Inapplicable Item 10. Certification By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. Signature After reasonable inquire and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: December 31, 2001 Signature: __/S/ Peter Giannakoulis_________ Name/Title: Peter Giannakoulis Securities Trading Manager -5-