Manufacturer MedImmune, LLC announced a voluntary recall of 13 lots of live, intranasal H1N1 vaccine recently, but not because of safety concerns. The affected lots were prefilled doses formulated for intranasal administration to persons aged 24 months to 49 years old.
The recall happened after market testing done by MedImmune indicated that the strength of the vaccine had dropped since its production. The CDC and FDA have determined that the vaccine was safe and posed no health threat for the persons who received those lots.
The Huron County General Health District gave one of the recalled lots of H1N1 vaccine.
"What the recall means," explained Chris Cherry, Director of Nursing, "is that sometime between the release of the vaccine and yesterday, the antigens, or the part of the vaccine that causes a person to develop immunity, fell below the preferred level for vaccine effectiveness. However, the lot number of the vaccine that was given by the Huron County General Health District is being recalled because it may lose its effectiveness before the expiration date, but it hasn't yet."