Section 906 Certifications
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I, Charles E. Porter, a principal executive officer of the Funds listed
on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period
ended February 29, 2004 fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Form N-CSR of the Funds listed on
Attachment A for the period ended February 29, 2004 fairly presents, in all
material respects, the financial condition and results of operations of
the Funds listed on Attachment A.

/s/Charles E. Porter        Date: May 3, 2004
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Charles E. Porter, Principal Executive Officer




Section 906 Certifications
- ---------------------------
I, Steven D. Krichmar, the principal financial officer of the Funds listed
on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period
ended February 29, 2004 fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Form N-CSR of the Funds listed on
Attachment A for the period ended February 29, 2004 fairly presents, in all
material respects, the financial condition and results of operations of
the Funds listed on Attachment A.

/s/Steven D. Krichmar       Date: May 3, 2004
- ----------------------      -----------------
Steven D. Krichmar, Principal Financial Officer




Attachment A
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Period(s) ended February 29, 2004

014 Putnam High Yield Trust
018 Putnam Global Natural Resources Fund
021 Putnam Health Sciences Trust
061 Putnam High Income Bond Fund
224 Putnam High Income Opportunities Trust
274 Putnam New Value Fund
2AZ Putnam International Capital Opportunities Fund
2MF Putnam Small Cap Value Fund
2UO Putnam International Blend