Creating 100% Pathogen Free Environments

October 20, 2010 — Medizone International Announces Successful Completion of First Round of Hospital Beta-Testing for AsepticSure™

Kingston, Ontario, Canada--October 20, 2010--Medizone International Inc. (OTCBB:MZEI) (OTCQB:MZEI) announced today successful completion of the first phase of AsepticSure™ beta testing at Hotel Dieu Hospital, an ambulatory care teaching and research hospital affiliated with Queen’s University in Kingston, Ontario, Canada.

Dr. Michael E. Shannon, stated, "We are absolutely delighted with the results. Pre-inoculated stainless steel test discs as well as carpet swatches typically found in many health care facilities were placed in selected locations to assess for antimicrobial effects.  Not only were 100% of the MRSA and C. difficile spores eliminated from the stainless steel discs (7.1 logs bacterial kill for MRSA and 6.2 log bacterial kill for C difficile spores), the pathogens were also completely eliminated from all contaminated carpet samples, something unachievable with any other technology we are aware of. Thus, the system performed to our highest expectations.  The AsepticSure™ system has proven to be able to achieve a very high level of microbial kill to the sterilization standard of >6 log (99.9999%) in the laboratory setting and now in a hospital setting.”

Dr. David Pichora, a leading orthopedic and hand surgeon, and the hospital’s Chief Executive Officer observed, “I am pleased that Hotel Dieu Hospital has been able to participate in what appears to be a promising breakthrough in addressing the global challenge of reducing hospital acquired infections.  The results of the AsepticSure™ sterilization technology tests are encouraging. Technology that could help hospitals improve patient safety, reduce infection rates and reduce costs is exciting, indeed. We are pleased to be participating in this safety initiative and we look forward to continued participation.”

Medizone International, Inc., is a research and development company engaged in developing its AsepticSure™ System to decontaminate and sterilize hospital surgical suites, emergency rooms, intensive care units, patient rooms, schools and other critical infrastructure. A government variant is being developed for bio-terrorism counter measures with additional variants for sports facilities and food processing applications.

Hotel Dieu Hospital is the ambulatory care teaching hospital for Kingston and Southeastern Ontario, providing expert care to more than 500,000 people in the region.  Our specialized services include outpatient pediatrics, ophthalmology, diabetes education, breast assessment, day surgery, urgent care and mental health programs.  Affiliated with Queen's University, we are partners within Kingston's university hospitals, delivering quality health care, leading innovative research and training the health care professionals of tomorrow. Leading Care. Changing Lives.

This Press Release may contain certain forward looking statements that involve substantial risks and uncertainties, including, but not limited to, the results of ongoing clinical studies, economic conditions, product and technology development, production efficiencies, product demand, competitive products, competitive environment, successful testing and government regulatory issues. Additional risks are identified in the company's filings made with the Securities and Exchange Commission.

Investor Relations:
The Eversull Group, Inc.
Jack Eversull
jack@theeversullgroup.com
972-571-1624 /  (fax) 214-469-2361

Web site: www.medizoneint.com
E-mail: operations@medizoneint.com

Contact:

Medizone International, Inc. (MZEI.OB)

4000 Bridgeway, Suite 401,
Sausalito, CA 94965

Telephone: 415-331-0303

Email
: operations@medizoneint.com

Investor Relations:

John Pentony

Investor Relations,
Medizone International, Inc.

Telephone: (415) 331-0202

E: j.pentony@medizoneint.com

Media Contact:

Gary Hanauer

Media Relations,
Medizone International, Inc.

Telephone: (510) 686-1238

E: GarHan@aol.com