Certain lots of the H1N1 vaccine have been recalled due to a lower than desired level of protective antigen in the vaccine. This is not a safety-related recall. The affected lots are for children 6 - 35 months of age, and unfortunately, the lots in Dallas County are among those affected. The CDC announcement here has full details. Children who have received this vaccine should still develop a good immune response, particularly if they receive the recommended second booster dose 28 days later. It is not necessary to repeat the first dose. Please contact us if you have specific questions about your child's vaccine. Again, this is not a safety issue and is unlikely to be a clinically significant issue for children.