Aflatoxin, produced by the fungi Aspergillus flavus and A. parasiticus, is the most potent naturally occurring human hepatocarcinogen. Food crops colonized by these fungi, especially maize and groundnut, are the major sources of dietary aflatoxin exposure. Aflatoxin and chronic hepatitis B virus (HBV) infection, two liver cancer risk factors that synergize with each other, are prominent in sub-Saharan Africa and certain parts of Asia. Furthermore, increasing evidence from epidemiological studies suggests that aflatoxin may cause child growth impairment, which can increase risks of premature deaths. A broad range of aflatoxin control strategies, developed to reduce aflatoxin exposure or its toxicity, include preharvest, postharvest, and dietary interventions; as well as the HBV vaccine, which does not reduce aflatoxin exposure but reduces the risk of aflatoxin-induced liver cancer.
We compared the efficacy and the cost-effectiveness of four aflatoxin risk-reduction strategies: HBV vaccine, biocontrol (preharvest), a postharvest intervention package, and NovaSil clay (dietary) in preventing liver cancer and stunting in Nigeria. Aflatoxin and chronic HBV infection are attributable for 8-27%, and 59-62%, respectively, of total liver cancers in Nigeria. We found that the HBV vaccine provides the greatest health-based efficacy and the lowest cost to avert one disability-adjusted life year (DALY) in Nigeria, compared with the selected aflatoxin control interventions. The prospective burden of aflatoxin-related stunting in Nigeria varies depending on aflatoxin exposure levels, which can vary substantially by year and location. At higher levels of aflatoxin exposure, the burden of aflatoxin-associated stunting is significant. Preventing stunting by any of these interventions would greatly reduce the cost per DALY and turn these interventions from non-cost-effective to very cost-effective. Our technical feasibility assessments of these four interventions suggest some advantages and disadvantages of
each intervention over the others. These data are crucial components in a decision making process to effectively allocate public health resources, and to position interventions for further development of public health interventions to prevent some aflatoxin-related public health problems, especially in high risk populations.
| Identifer | oai:union.ndltd.org:PITT/oai:PITTETD:etd-04072011-133544 |
| Date | 22 September 2011 |
| Creators | Khlangwiset, Pornsri |
| Contributors | Claudette St. Croix, Aaron Barchowsky, John Mendeloff, Felicia Wu |
| Publisher | University of Pittsburgh |
| Source Sets | University of Pittsburgh |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.pitt.edu/ETD/available/etd-04072011-133544/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Pittsburgh or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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