Health officials say all the initial swine flu vaccine doses this week will be the nasal spray version, but next week arm injections will begin.
About 2.2 million doses of nasal spray are available so far, but the spray is not recommended for some of the people who are most in danger of complications from flu, including pregnant women and people with asthma. So while some priority groups like health care workers and healthy children 2 or older can get vaccinated this week, pregnant women and others at risk should wait.
At a Centers for Disease Control and Prevention press conference Tuesday, CDC officials said demand for the vaccine is so far outstripping supply, but they did not quantify by how much, according to the Associated Press' report.
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