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Iomai Dose-Ranging Trial Demonstrates Needle-Free Patch Vaccine for,Travelers' Diarrhea Stimulates Immune Response Even at Low Doses

-- Data Gathered to Assist in Design of Future Trials, Other Programs --

GAITHERSBURG, Md. and LISBON, Portugal, April 26, 2007 /PRNewswire-FirstCall/ -- Iomai Corporation today announced results from a 400-patient, Phase 2 dose-ranging trial of its patch-based vaccine for travelers' diarrhea. The trial was conducted to assess the ability of a range of vaccine doses to generate an immune response against enterotoxigenic E. coli (ETEC) bacteria -- the most common cause of travelers' diarrhea. Researchers found that even at the lowest dose tested, an Iomai patch applied to the arm generated a robust response in more than 95 percent of patients.

The results were presented today by Iomai's Vice President of Clinical Development, Sarah A. Frech, DVM, at the Vaccines for Enteric Diseases 2007 conference in Lisbon, Portugal.

"These results demonstrate the power of Iomai's technology by showing that even a small dose of vaccine, applied to the skin via a patch, is enough to stimulate a robust immune response. The data will help us determine the dose that we will use in our ETEC product," said Gregory M. Glenn, MD, Senior Vice President and Chief Scientific Officer of Iomai. "Iomai's research has shown that, in addition to showing potential benefits against ETEC, the active ingredient in the patch also works as an immune-boosting adjuvant when the patch is used in combination with injected vaccines for influenza. Thus, the results from the dose-ranging ETEC study will also help determine doses for future studies of the Iomai booster patch for seasonal and pandemic influenza."

Travelers' diarrhea sickens between 20 and 50 percent of international travelers to areas where the bacteria is endemic, but no ETEC vaccine is available in the United States. The existing strategy for avoiding travelers' diarrhea -- prophylactic antibiotics -- raises concerns about antibiotic resistance and drug side effects.<
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