The US Food and Drug Administration (FDA) announced today that it has approved 4 vaccines against the 2009 influenza A (H1N1) virus, formerly known as "swine flu." The vaccine lots are expected to be available and distributed within the next 4 weeks.
The FDA warns that persons with known allergies to chicken eggs or any other substance in the vaccine should probably not be vaccinated, although in the ongoing clinical trials, the vaccines have been well tolerated. The most common adverse effect is soreness at the injection site; other adverse effects can include a mild fever, body aches, and fatigue for a couple of days after vaccination. For the nasal spray delivery system, the most common adverse effects were runny nose, nasal congestion in all ages, sore throats in adults, and fever in children aged 2 to 6 years.
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