Immune Responses to Smallpox Vaccination
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ClinicalTrials.gov Identifier: NCT00325975 |
Recruitment Status
:
Completed
First Posted
: May 15, 2006
Last Update Posted
: April 17, 2018
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This study will examine how people s immune systems respond to inoculation with vaccinia virus the standard vaccine used to protect against smallpox and how these responses correlate with symptoms they develop after receiving the vaccine.
People 18 years of age and older who are scheduled to receive smallpox vaccination as a routine part of their employment (e.g., laboratory worker, health care worker, or emergency response worker) may be eligible for this study. They may or may not have been vaccinated previously. In addition, individuals who were vaccinated against smallpox at least 6 months before starting the study may participate as control subjects. All candidates will be screened with a brief medical history and physical examination.
Participants in the following vaccination categories will undergo the procedures described for their group:
Vaccine Recipient Frequent Follow-up
Participants will come to the NIH Clinical Center every 2 to 3 days for a total of 7 visits over a 2-week period. At each visit, starting the day of vaccination, they will have the following procedures:
- Brief skin examination, possibly with photographs of skin lesions;
- Throat and skin swabs for vaccinia virus culture;
- Blood draw (about 8 teaspoonfuls).
Additional blood samples will be collected 1 month after vaccination and again within a year after vaccination. The blood will be analyzed for the immune response to the vaccine, genetic differences that might influence differences in immune response, and the presence of vaccinia virus.
Participants will fill out a diary card every day for 3 weeks after vaccination to record any symptoms. Individuals who develop symptoms lasting more than 2 weeks, such as persistent or new skin lesions, will return to the clinic for additional skin exams and blood tests. Individuals who develop vaccine side effects may have a urine culture for vaccinia virus.
Vaccine Recipient Infrequent Follow-up
Participants will come to the NIH Clinical Center for blood tests on the day of vaccination, 4 weeks after vaccination, and once again within a year after vaccination. At each visit, 6 teaspoonfuls of blood will be drawn. This group will also include individuals who have been vaccinated within 8 months of entering the study and are not currently receiving the vaccine, but for whom blood samples are not available.
Control Group Vaccinated at Least 6 Months Before Entering the Study
Participants will come to the NIH Clinical Center for blood tests every 2 to 3 days for 2 weeks, then at 1 month after the first blood draw, and again within a year of the first blood draw. About 8 teaspoonfuls of blood will be drawn at each visit.
Condition or disease |
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Smallpox Vaccine |
Study Type : | Observational |
Actual Enrollment : | 69 participants |
Observational Model: | Cohort |
Time Perspective: | Cross-Sectional |
Official Title: | Immune Responses to Vaccinia Virus Vaccination |
Study Start Date : | February 4, 2003 |
Study Completion Date : | March 15, 2016 |

- Vaccinia virus is used to vaccinate persons to prevent disease with smallpox. Limited information is available regarding cellular immune responses to vaccinia virus. We will obtain blood from vaccinated persons and measure immune responses in vi... [ Time Frame: Upon review of all data ]

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Ages Eligible for Study: | 18 Years and older (Adult, Senior) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
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INCLUSION CRITERIA:
18 years of age or older
Both males and females
Patients will be checked on day 0 and those with a hemoglobin of greater than or equal to12 g/dL will have blood drawn as described in the protocol. Patients with a hemoglobin of 11-11.9 will have a 50% reduction in the amount of blood drawn after the first visit from 40 ml per visit to 20 ml per visit. Patients with a hemoglobin less than 11 g/dL will be terminated from the study and referred for medical follow-up.
Able to sign the consent form and be willing to comply with study procedures.
Must be a laboratory worker, health care worker, or emergency response worker who is receiving smallpox vaccination as a routine part of employment. Persons who were previously vaccinated at least 8 months ago are eligible.
EXCLUSION CRITERIA:
Active substance abuse or history of prior substance abuse that may interfere with protocol compliance or compromise patient safety.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00325975
United States, Maryland | |
National Institutes of Health Clinical Center, 9000 Rockville Pike | |
Bethesda, Maryland, United States, 20892 |
Principal Investigator: | Jeffrey I Cohen, M.D. | National Institute of Allergy and Infectious Diseases (NIAID) |
Publications:
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: | National Institute of Allergy and Infectious Diseases (NIAID) |
ClinicalTrials.gov Identifier: | NCT00325975 History of Changes |
Other Study ID Numbers: |
030090 03-I-0090 |
First Posted: | May 15, 2006 Key Record Dates |
Last Update Posted: | April 17, 2018 |
Last Verified: | March 15, 2016 |
Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ):
Smallpox Variola Orthopoxvirus |
Virus Immunogenicity Smallpox Vaccine |
Additional relevant MeSH terms:
Smallpox Poxviridae Infections DNA Virus Infections Virus Diseases |