However , cyanuric are not of concern in levels below 100 parts per billion . Official says FDA has tested 74 samples of U.S.-made baby formula . Some samples tested positive but at safe levels , official says . Sundlof said the trace levels of melamine or related compounds detected in the samples are 10,000-fold less than the amount associated with Chinese infant-formula contamination . These are far below those tested with Chinese formula .
However , cyanuric are not of concern in levels below 100 parts per billion . Official says FDA has tested 74 samples of U.S.-made baby formula . Some samples tested positive but at safe levels , official says . These are far below those tested with Chinese formula .