We expect that communities in which abundances of non-mouse hosts are increased will be characterized by: (1) lower average larval burdens on mice; (2) lower densities and survival rates of mice;
(3) lower total larval populations that feed on mice;
(4) lower survival of larvae to the nymphal stage; (5) lower nymphal densities; and (6) lower infection prevalences of nymphs with B. burgdorferi.
This research, combined with related efforts to understand the anthropogenic causes of change in host diversity and community composition, will provide the basis for a workshop that will foster interdisciplinary interactions among
ecologists, epidemiologists, geographers, urban/suburban planners, and members of local, county, and state government (e.g. planning boards, zoning boards).
The expected result of this workshop is a tentative set of guidelines to reduce LD risk. By better understanding disease dynamics,
we may be able to develop new, non-chemical, environmentally based strategies to ameliorate disease transmission, while at the same time relying less on the use of pesticides. These new strategies can be part of an IPM approach to manage pest-borne diseases.
Purpose/Objective:
Vector-borne zoonoses pose threats to human health throughout the world. Both anticipation of disease outbreaks and intervention that is effective in reducing risk are crucial for
protecting public health. Such anticipation and intervention require a robust understanding of ecological conditions responsible for variation in disease threats.
The proposed study will examine the broad context of interactions between ecological
systems and human health to better understand the complex life cycle of Lyme disease, the most frequently reported vector-borne disease in the United States.
Research is needed that focuses on the interactions among ticks, bacterial pathogens, the community of vertebrate hosts, and the landscapes in which vectors, pathogens, hosts, and humans interact to affect exposure to Lyme disease (LD).
Risk of exposure to LD in the northeastern USA is a function of the abundance and Borrelia burgdorferi-infection prevalence of nymphal Ixodes scapularis ticks.
The objective is to understand the mechanism(s) by which host diversity and community composition, as affected by anthropogenic
changes to the landscape and other social stressors, drive human risk of infection with zoonotic pathogens, using LD as a model system.
Record Details: Record Type: PROJECT (ABSTRACT) Start Date: 01/01/2008 Completion Date: 12/31/2010 Record Last Revised: 11/13/2008 Record Created: 11/13/2008 Record Released: 11/13/2008 Record ID: 200898 Show Additional Record Data Hide Additional Record Data Keywords: landscape epidemiology, integrated pest management against disease vectors, vector-borne disease, community ecology,,
Related Organizations: Role: OWNER Organization Name: CARY INSTITUTE OF ECOSYSTEM STUDIES Mailing Address: Box AB, Citation: Millbrook State: NY Zip Code: 12545
Project Information:
Approach:
We conceive of this effort broadly as providing the foundation for Integrated Pest Management (IPM), applied to ecological communities within which disease vectors are embedded.
This research is composed of intensive, well-replicated, experimental field manipulation of the vertebrate communities that supply blood meals and B. burgdorferi infections to the tick
vectors, to explore the causes of variation in entomological LD risk. Both diversity and community composition of hosts will be manipulated by removing and translocating two competent reservoirs for B. burgdorferi:
white-footed mice (Peromyscus leucopus), eastern chipmunks (Tamias striatus), and one incompetent reservoir: gray squirrels (Sciurus carolinensis) in forest fragments.
Abundances of other hosts will be monitored. New statistical approaches will be used to evaluate the relative importance of the causes of variation in both tick abundances and infection prevalence.
Evidence will be evaluated for three specific mechanism by which high host diversity might reduce disease risk:
(1) reducing encounter rates between ticks and P. leucopus; (2) regulating abundance of P. leucopus; and (3) regulating abundance of I. scapularis. The studies will be conducted in Dutchess County, New York, which has among the highest numbers of cases and incidence rates of LD in the United States.
Cost: $750,000.00 Research Component: Health Effects
Project IDs: ID Code: R833776 Project type: EPA Grant
Posts: 571 | From Massachusetts | Registered: Oct 2008
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