Biology Reference
In-Depth Information
CHAPTER
13
Ascaris lumbricoides and
Ascariasis: Estimating Numbers
Infect
ed and Burden of D
isease
Simon J. Brooker, Rachel L. Pullan
London School of Hygiene & Tropical Medicine, London, UK
OUTLINE
Introduction
343
The Global Limits of Transmission
346
A Shrinking Global Distribution
346
Global Numbers at Risk and Infected
349
Global Disease Burden
352
Burden of Ascariasis in 2010
358
Limitations of the DALY Approach and a Broader View of Impact
359
References
359
INTRODUCTION
Ascaris lumbricoides is an intestinal nematode (or soil-transmitted
helminth, STH) that is among the most common of all chronic infec-
tions of humans. It occurs and flourishes where climatic conditions permit
the survival and development of its free-living stages and where poverty,
