The director of the Centers for Disease Control and Prevention urged health officials around the country Thursday to ensure swine-flu vaccine is getting to high-risk groups, after criticism erupted over distribution to some Wall Street firms.

Goldman Sachs Group Inc., Morgan Stanley and Citigroup Inc. are among several large New York City employers that got doses of the H1N1 vaccine, which remains in short supply as the new flu virus continues to spread and manufacturers struggle to produce ample stocks of vaccine quickly.

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