Statement by Dr. Anthony Fauci, NIH Regarding Early Results from Clinical Trials of 2009 H1N1 Influenza Vaccines in Healthy Adults

Statement by Dr. Anthony Fauci
Director, National Institute of Allergy and Infections Diseases, NIH
Regarding Early Results from Clinical Trials of 2009 H1N1 Influenza
Vaccines in Healthy Adults

We are encouraged by reports that are now emerging from various clinical trials of 2009 H1N1 influenza vaccines, conducted by various vaccine manufacturers. We expect additional companies to announce their preliminary trial results shortly. The early data from these trials
indicate that 2009 H1N1 influenza vaccines are well tolerated and induce a strong immune response in most healthy adults when administered in a single unadjuvanted 15-microgram dose. We congratulate the companies on these trials, which are an important part of the ongoing worldwide effort to develop vaccines to protect the public from 2009 H1N1 influenza.

The National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, also is conducting clinical trials of 2009 H1N1 influenza vaccines, produced by Sanofi Pasteur and CSL Limited. The NIAID trials are testing two different dosages (15 micrograms versus 30 micrograms) and evaluating the immune response to one and two doses of these vaccines. More than 2,800 people are participating in ongoing NIAID trials of these vaccines.

We are pleased to note that preliminary analyses of early data from the NIAID trials align with the recently announced findings and those to be announced imminently by other companies in that both vaccines studied induced what is likely to be a protective immune response in most adults following a single dose in the same amount (15 micrograms) used in seasonal flu vaccines. Specifically, in blood samples obtained 8 to 10 days after vaccination:

* Among healthy adults who received a single 15-microgram dose of
the Sanofi Pasteur vaccine, a robust immune response was measured in 96
percent of adults aged 18 to 64 and in 56 percent of adults aged 65 and
older.
* Similarly, among healthy adults who received a single
15-microgram dose of the CSL Limited vaccine, a robust immune response
was measured in 80 percent of adults aged 18 to 64 and in 60 percent of
adults aged 65 and older.

Additional data from the NIAID trials are forthcoming. However, on the basis of these strong early data, our results are consonant with other reports that a single 15-microgram dose of unadjuvanted 2009 H1N1 influenza vaccine is well tolerated and induces a robust immune response in healthy adults between the ages of 18 and 64. For adults aged 65 and over, the immune response to 2009 H1N1 influenza vaccine is somewhat less robust, as is the case with seasonal influenza vaccines.

We note that the slight discrepancies seen in our trials between the Sanofi Pasteur and CSL Limited vaccines may be due to technical differences in the preliminary measurement of the amounts of antigen in the doses used in the clinical trial lots and the relatively limited numbers of samples studied to date, as well as the fact that our data are drawn from a very early time point after immunization.

NIAID will continue to provide timely updates on these trials as well as those in children and in pregnant women, which began later.

Information from the NIAID studies will help inform the development of recommendations for immunization schedules, including the optimal dosage and number of doses for different age groups.

NIAID is conducting these clinical trials through its longstanding vaccine clinical trials infrastructure: the Vaccine and Treatment Evaluation Units, a network of medical centers that offers rapid response capability to test vaccines for emerging public health concerns. Detailed information is available from the NIAID Web site (www.niaid.nih.gov) and from http://ClinicalTrials.gov.

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Vaccinations of Volunteers Start in First H1N1 Clinical Trial

Emory University researchers began vaccinating volunteer participants Aug. 10 in the first of several planned clinical trials of a new H1N1 vaccine.

The clinical trials are being conducted by the eight Vaccine and Treatment Evaluation Units (VTEUs), supported by the National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health (NIH).

Emory began signing up several hundred interested volunteers about two weeks ago and has been screening the volunteers to make sure they fit certain criteria. Volunteers will receive their first vaccinations over the first week of the trial and will return several times over the course of nine weeks to receive additional vaccinations and blood tests.

The Emory clinical trial will evaluate the safety and immune response to an H1N1 vaccine and also help determine how the pandemic flu shot should be given along with the seasonal flu shot to make it most effective. Participants will receive two H1N1 vaccinations concurrent with, before, or after, the seasonal flu shot.

The trials are being conducted in a compressed timeframe because of the possible fall resurgence of pandemic H1N1 flu infections that may coincide with the circulation of seasonal flu strains in the Northern Hemisphere.

The trials are expected to gather critical information that will allow the NIH to quickly evaluate the new vaccines to determine whether they are safe and effective in inducing protective immune responses. The results will help determine how to begin a fall 2009 pandemic flu vaccination program.

The U. S. government declared the H1N1 outbreak a public health emergency in April and two months later, the World Health Organization classified the outbreak a pandemic, reflecting its widespread nature.

“We have had a tremendous response from volunteers wanting to participate in the clinical trials,” says Mark Mulligan, MD, principal investigator of the Emory VTEU and executive director of the Hope Clinic of the Emory Vaccine Center. “Hopefully this will make it much easier to have a vaccine available for the fall flu season. We are very appreciative of the efforts of our volunteers.”

This first adult clinical trial as well as subsequent pandemic vaccine clinical trials will be conducted at the Emory Vaccine Center’s Hope Clinic in nearby Decatur. Pediatric clinical trials will be initiated one week after the first adult trial and will be conducted at the Emory-Children’s Center on Emory University’s campus. Harry Keyserling, MD, and Paul Spearman, MD, co-directors of the Emory VTEU, lead the pediatric studies at Emory-Children’s Center.

The VTEUs were established in 1962 as a vital research component of the NIAID. The units conduct clinical trials for all infectious diseases other than HIV/AIDS. They have conducted hundreds of clinical studies over the past four decades. Emory was designated a VTEU site in 2007 and received a seven-year contract of approximately $23.7 million.

An important strength of the VTEUs is their ability to rapidly enroll large numbers of volunteers into trials and to immunize the volunteers in a safe, effective and efficient manner. This rapid-response capability is especially important for testing vaccines designed to combat pandemic influenza. Results are expected to be available weeks after the trials begin.

In addition to Emory, VTEU sites are Baylor College of Medicine, Houston; Children’s Hospital Medical Center, Cincinnati; Group Health Cooperative, Seattle; Saint Louis University, St. Louis; University of Iowa, Iowa City; University of Maryland School of Medicine, Baltimore; and Vanderbilt University, Nashville. They will be joined for these studies by Children’s Mercy Hospital in Kansas City and Duke University Medical Center.

For more information about the Emory flu clinical trials, call 877-424-HOPE (4673) for the adult and senior studies, or 404-727-4044 for the pediatric studies, or e-mail for further information about the upcoming trials.

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