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Estimates of pathogen exposure predict varying transmission likelihood: Host contact and shedding patterns may clarify disease dynamics in desert tortoises Gopherus agassizii

Metadata Updated: October 28, 2023

These datasets (S2-S3) document the transmission of a bacterial pathogen (Mycoplasma agassizii) between desert tortoises (Gopherus agassizii) experimentally introduced in captivity and were used to create and compare models predicting transmission probability given data on the hosts and their interactions. Dataset S2 includes variables describing the individual tortoises interacting, e.g. id, sex; variables describing the length of their interaction, e.g., number of days cohabitating, hours of direct contact; and variables estimating the infection level (based on data in S3) of infected tortoises involved in the interaction with the focal host. Interaction time and the amount of bacteria present in an infected host were used to calculate “dose” variables that represent the intensity of exposure to the pathogen. These data were used to estimate model parameters for multiple generalized linear models (glm) with predictor variables related to exposure time to an infected host and host characteristics. The response variable or event of interest was the infection status of the exposed tortoise after a period of interaction. Infection status was defined in two ways (described in section 15) and determined using qPCR of tissue samples collected at intervals – the results of which are presented in the S3 dataset. The analyses allowed us to identify interactions that have high transmission likelihood, and so we explored the contact patterns of a wild tortoise population (25 individuals with overlapping or contiguous homeranges) to estimate how frequently high-risk contacts occur (Dataset S4). This dataset includes all interactions (tortoise ids of interacting pair, date & time interaction began, and interaction duration) documented between tortoises fitted with proximity logging devices. Each device detects other devices when tortoises are approximately 10 cm apart and ends an interaction when tortoises have remained further than 10 cm for 1 minute. These data are associated with the following publication: Aiello, C. M., Nussear, K. E., Esque, T. C., Emblidge, P. G., Sah, P., Bansal, S. and Hudson, P. J. (2016), Host contact and shedding patterns clarify variation in pathogen exposure and transmission in threatened tortoise Gopherus agassizii: implications for disease modelling and management. J Anim Ecol, 85: 829–842. doi:10.1111/1365-2656.12511

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023
Publisher U.S. Geological Survey
Identifier USGS:567ad1d7e4b0a04ef490fd8b
Data Last Modified 20200830
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 57daaf77-75e5-4fe3-a3f5-c56c43162182
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -116.64871215820314,35.25571238989172,-115.2410888671875,35.97988152042959
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 51c336417da35186ef88d3f91a04194746c9a6d548dfa1d057c26a6945a0f264
Source Schema Version 1.1
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