With permission from Ina Jurga, I copy here the reply she sent via e-mail to the ecosanres discussion forum - just for completeness:
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Dear Abraham
there are plenty! but you might not want to read them all. These are the 3 i can recommend:

WHO, Safer water, better health
www.who.int/quantifying_ehimpacts/public...rwater/en/index.html

easy accessible and understandable information

WaterAid: BAsic neglect
www.wateraid.org/documents/plugin.../wateraid_fatal_neglect.pdf

Jamie Bartram, Sandy Chairncross: Hygiene, Sanitation, and Water: Forgotten Foundations of Health
www.plosmedicine.org/article/info%3Adoi%...journal.pmed.1000367

Ina Jurga
Technical Officer Networking and Knowledge Management
Water Supply & Sanitation Collaborative Council (WSSCC)

Try this one:
Sanitation rated the greatest medical advance in 150 years (survey published in British Medical Journal, Jan. 2007.)
www.guardian.co.uk/society/2007/jan/19/h...h.medicineandhealth3

Regards
--Arno Rosemarin/SEI

Greetings. An NGO that normally works to provide drinking water treatment in
Central America is considering the idea of working with sanitation as well.

They have asked me to speak to them about the health benefits of dry toilets, including ecosan and VIP.

My question is if anyone can help me find studies and analyses of the measured
health benefit of owning a latrine, vs. open defecation. Their work so far with
water purification has had striking positive results on people's health, and I
think they will only start spending their resources on sanitation if they can
see evidence that sanitation will have comparable results.

This NGO works in both rural and urban communities.

Thanks very much,
Abraham Noe-Hays
Full Circle Compost Consulting
Putney, Vermont, USA