over and above = except that?

Context:

In July 1999 the US’ National Vaccine Information Center declared in a press release that, "The cumulative effects of ingesting mercury can cause brain damage." The same month, the American Academy of Pediatrics (AAP) and the Centers for Disease Control and Prevention (CDC) alerted the public about the possible health effects associated with thimerosal-containing vaccines. They strongly recommended that thimerosal be removed from vaccines as soon as possible. Under the directive of the FDA Modernization Act of 1997, the Food and Drug Administration also determined that infants who received several thimerosal-containing vaccines may be receiving mercury exposure over and above the recommended federal guidelines.7