Sorry for multiple posts but just wanted to say to curlew that I hope you do start that polio thread because in addition to what I said earlier, I would be really interested in a discussion of Non Polio Acute Flaccid Paralysis (NP-AFP), especially in the explosion of cases which have occurred in India as polio paralysis has been reducing.
I don't know a lot about this but wonder if there are other viruses that compete with polio in the human gut or if immunity to wild polio provides protection against other paralysis inducing enteroviruses.
Certainly there is plenty to discuss here.
wwwnc.cdc.gov/eid/article/18/11/11-1457_article.htm
However, analysis of WHO-monitored polio surveillance data on the number of AFP, polio AFP, and NP-AFP cases available at the public domains (www.polioeradication.org/External Web Site Icon; www.searo.who.int/vaccineExternal Web Site Icon; www.npspindia.org/External Web Site Icon) (2?5) from 1998 through June 2, 2012, in India shows that concomitant with the phenomenal elimination of wild poliovirus transmission in India was an annual increase in the number of reported AFP cases from 2005 to date throughout the country (2?4). Although 8,103?9,705 were reported during 1998?2003, a total of 55,782 and 60,883 cases were reported during 2010 and 2011, respectively. Through June 2, a total of 20,677 AFP cases were reported in India during 2012, compared with 18,625 during the corresponding period in 2011 (4). This large increase in NP-AFP cases, which represent AFP cases caused by agents other than poliovirus, probably reflects the excellent implementation of the expanded definition of AFP and highly sensitive surveillance and detection methods used by NPSP in India from 2005 onwards, in contrast to the other polio-endemic countries, i.e., Pakistan, Nigeria, and Afghanistan, where the expanded AFP surveillance is not in place (1?5). The large increase in the NP-AFP rate from 1.45 and 1.97 per 100,000 children during 1998?2003 to 16.20 in 2011 (3?5) further reflects the excellent operational performance of the expanded AFP surveillance in India.