Astronomy: X-ray images highlight galaxy collisions.

J A N U A R Y 1 0 , 2 0 0 4 V O L . 1 6 5 2 9 report in the Dec. 6, 2003 Lancet. The response was best after the booster shot, but signs of immunity were already present 2 weeks after the first injection, Gambotto says. What’s more, when the scientists took blood from each monkey and exposed the sample to live SARS virus in a lab dish, the antibodies and T cells neutralized the virus. Gambotto and his colleagues now intend to test the vaccine in ferrets exposed to SARS virus. Ferrets are more susceptible to the disease than rhesus macaques are. Several groups are working on SARS vaccines. Gambotto predicts that one or more of these vaccines could reach large human trials within a year or two, especially if more outbreaks warrant an expedited approach. —N.S.