Anthrax Vaccine Clinical Trials

This study will examine the recombinant, that is, produced by genetic engineering, protective antigen (rPA) that brings about antibodies to neutralize the anthrax toxin and that could therefore be predicted to offer protection against anthrax. Today, anthrax is rarely encountered in the United States, since the introduction of vaccines for cattle in the 1930s. A human vaccine was licensed in 1970. Vaccination against anthrax has been confined to people at risk, such as wool sorters and some veterinarians. However, the rising prospects of B. anthracis being used as a weapon have led to routine administration of the anthrax vaccine to members of the armed forces.

Adults who are in good health may be eligible for this study. The involvement of 300 adults is planned.

Participants will have a general physical exam and test for vital signs. There will also be collection of blood for chemistry and hematology; urinalysis; tests for HIV, hepatitis B and C, and liver function; and a pregnancy test, if applicable.

On a random basis, patients will receive one of the rPA formulations. Two doses of rPA will be evaluated, 10 microgram ((Micro)g) and 20 (Micro)g. This evaluation aims to establish the safety and most desirable level of dosage. Patients will receive one injection of the vaccine, administered in the left shoulder or left thigh. About 30 minutes later, their temperature will be taken, and the injection site will be inspected. Rare but severe reactions could occur if there is extreme sensitivity to a vaccine. However, such an occurrence is extremely rare following a vaccine, and if there are any dangerous symptoms, they can be effectively treated by medications available to patients while they are at the clinic. If there are no significant abnormal results, patients may return home. About 6 hours later and daily for 7 days, they will take their temperature and examine the injection site. The vaccine may cause temporary discomfort at the site of injection, and participants may experience a mild fever for 1 or 2 days after vaccination.

Patients will receive diary cards, a digital thermometer, and instructions on taking their temperature and measuring redness and swelling at the injection site, as well as for recording aches, muscle pain, or sensitivity to light for 7 days. They will be examined at the clinic at 72 hours following vaccination and also on the 7th day if they have a fever at or above 100.4 , if swelling is at or more than 2 inches, or if they request an exam. Meanwhile, a clinic staff member will call patients and discuss the findings. Then patients will receive a second and third injection of the same vaccine at 2-month intervals. There will also be interviews about patients' health at each visit to the clinic, plus monitoring of the vaccination after 6 hours and for 7 days. One year later, patients will receive a fourth injection of the same vaccine.

Direct benefit to participants in this study is not guaranteed, although an antibody response is predicted. The results in this study will help in the development of improved vaccines for anthrax.