FluMist in Egg Allergic Patients

Study Summary

With the growing public health concerns of seasonal influenza and H1N1 in the United States, the primary means by which this can be addressed is with prevention, namely, vaccination against the influenza virus. The only individuals not able to receive this vaccination in the primary care provider's office are those patients with egg allergies and, in rare circumstances, individuals with allergies to other components of the vaccine. Current guidelines allow for the administration of the influenza vaccine to patients with egg allergy using vaccines with low egg protein (ovalbumin) content or by using skin testing followed by a 5-dose desensitization protocol. Since this is impractical to perform in the primary care office and cumbersome for allergists, many egg-allergic patients simply do not receive the influenza vaccine, leaving them more vulnerable to the disease and more likely to become a source of contagion. Several studies have suggested that influenza vaccination using a 1-2 dose protocol may be safe. This fact is due in large part to the low ovalbumin (egg protein) content in modern influenza vaccines. All studies of influenza vaccination in egg-allergic patients have been done using intramuscular trivalent inactivated influenza vaccine (TIV). However, the trivalent live-attenuated, cold-adapted influenza vaccine (LAIV), which is delivered intranasally, has a lower published ovalbumin content than the injectable vaccines, suggesting that it may also be well-tolerated by egg-allergic patients. According to several studies, LAIV may be more efficacious than TIV in children. It is the goal of the investigators to evaluate the safety of immunizing egg-allergic individuals with the LAIV.

Interventions

• BIOLOGICAL FluMist intranasal influenza vaccine
• BIOLOGICAL Intramuscular influenza injection ("flu shot")