Censorship of science?

Does this really count as censorship of science? Is it warranted? Likely to be effective in avoiding "Contagion"?

               The government advisory board that oversees biosecurity in the U.S. is asking the scientific journals Nature and Science to censor details of recent studies on bird flu due to concerns about biological terrorism. Researchers created mutations of the H5N1 virus, making it transferable between mammals through the air. In 60 percent of human cases, this strain of avian flu is fatal. At present, only 350 people worldwide have died because of the flu, only because it can be contracted via direct contact with infected birds.

                D. A. Henderson, Christine Gorman