The PQS on-line catalogue includes details of all immunization-related products currently pre-qualified by WHO for procurement by United Nations agencies. The catalogue is produced and maintained by the Quality, Safety and Standards group in the Immunization, Vaccine and Biologicals Department of WHO, Geneva. It replaces the old WHO/UNICEF Product Information Sheets (PIS), the last edition of which was published in 2000. Only products included in the PQS catalogue are now recommended to be purchased by UN agencies. PQS performance specifications and verification protocols have been phased in on a category-by-category basis since 2006. There are many new specifications and the old PIS specifications and test procedures have also been replaced. Once a PQS specification has been published, manufacturers are granted a transition period in which to meet the new standards. Whenever a new product is pre-qualified, a data sheet is published on the PQS website.

This document and the individual product data sheets are available on the internet only at:

There is no hardcopy version. Each edition of the catalogue is date-stamped. It will be updated regularly to ensure that the information it contains is current. A related catalogue of WHO pre-qualified vaccines will be made available on the internet later in 2011. This will be published and managed in a similar manner. Details will be provided in future catalogue revisions