OUTLINE: All patients are treated with A1G4 diluted in sterile physiologic saline mixed with Bacillus Calmette Guerin (BCG) organisms. The vaccine is injected intradermally in multiple sites. Booster immunizations are administered during weeks 2, 4, 8, 12, 20, 28, 36, 44, 52. Immunizations are not administered in limbs where draining lymph nodes have been surgically removed or previously irradiated. Isoniazid is administered for 5 days after each BCG injection. If severe skin reactions are present at the injection site, the BCG dose is decreased. If skin reactions persist, the BCG dose is stopped but A1G4 injections continue.