LOS ANGELES --
Mass Swine Flu vaccinations begin this week and the government is tracking possible side effects.Health authorities hope to vaccinate more than half the population in the U.S. in just a few months.
Johns Hopkins University will direct e-mails to at least 100,000 vaccine recipients to track how they're doing.
The Centers for Disease Control and Prevention will be preparing take-home cards that show vaccine recipients how to report any side effects.
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