Once your order is reviewed and approved, you will receive a confirmation email with your sales order number(s). You may receive multiple sales order numbers for your items depending on their catalog number prefixes. The prefixes relate to which CDC program or activity has contributed financial support for these items and are necessary to track ongoing support. Separating orders also avoids program-specific shipping delays potentially affecting large or mixed program orders that may require multiple program approvals. IRR will ship items together when possible however, separating sales order numbers ensures that orders are shipped as efficiently as possible.