Saudi Arabia - Hajj
6 October 2011 - Update - Following recent reporting of polio cases in China and Kenya (see http://www.polioeradication.org/Dataandmonitoring/Poliothisweek.aspx ), travellers from these countries will require proof of oral polio vaccination (OPV) to apply for an entry visa for Saudi Arabia. Travellers arriving from these countries will also receive 1 dose of OPV at borders points on arrival in Saudi Arabia.
23 September 2011 - Requirements and recommendations for entry visas for the Hajj seasons in 2011 have been published in WHO's Weekly epidemiological report (WER). You may also consult the WHO's International Travel and Health book, Chapter 9 (see link below)