ABC anchorman Peter Jennings will host the first installment of a new quarterly PBS series on AIDS that will premiere Feb. 28. "AIDS is one of the most significant stories of the century," Jennings said. "It is much more than a medical emergency. It reveals difficult truths about life and death, science and money, politics and justice. As an individual, I must pay attention. As a journalist, I welcome the opportunity of `The AIDS Quarterly' to respond thoughtfully and in depth to this crisis." The AIDS show is being produced by WBGH, the Boston station that also produces "Nova" and "Frontline."