Rob Atwill, D.V.M., Ph.D. University of California-Davis
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1 Science and research on packstock and waterborne pathogens ~ misperceptions, realities, and the way forward ~ Rob Atwill, D.V.M., Ph.D. University of California-Davis
2 1993 outbreak of Cryptosporidium parvum associated with drinking water, Milwaukee YEAR CASES 1984 Texas 2, New Mexico Georgia 12, Pennsylvania Oregon 15, Wisconsin 403, Minnesota Washington Nevada Washington Florida Texas 32
3 California communities respond with much finger pointing
4 HORSES IN THE BACKCOUNTRY
5 1990 s team on waterborne protozoal pathogens Epidemiology (Atwill), hydrology (Harter), range ecology (Tate), livestock and wildlife biology, extension & outreach, regulatory agencies, affected industries & stakeholders Backcountry Horsemen of California
6 Waterborne zoonotic pathogen 1. Infectious agent is pathogenic for humans 2. Biological reservoir includes an animal 3. Modes of transmission include waterborne Helminths Protozoa Viruses Bacteria Fungi Prions
7 Waterborne Zoonotic Pathogens Organisms shed by animals and capable of producing disease in humans following a waterborne route of exposure Protozoa--1 o importance Cryptosporidium parvum Giardia duodenalis Etc. Bacteria--1 o importance Campylobacter Salmonella E. coli: indicator vs virulent Etc. Viruses--2 o importance Rotaviruses Hepatitis E Etc. Helminths--2 o importance Fasciola (liver flukes) Etc.
8 Developing beneficial management practices (BMPs): 1 goal is to match pathogen flux with local BMP efficacy Key processes driving waterborne zoonotic transmission A. Vertebrate pathogen loading: who sheds the pathogen? B. Hydrological transport: how are pathogens reaching water? C. Inactivation kinetics: can the pathogen survive long enough? D. Inter-species infectivity: is the pathogen infectious for humans?
9 Early studies on fecal shedding of Cryptosporidium and Giardia in horses and mules 1997, Johnson et al., J Vet Diagn Invest 0/91 horses shedding Crypto and Giardia 1998, Fio and Atwill, Center for Equine Health, UC Davis 2/108 (2%) shedding Crypto among foals and weanlings 0/75 shedding Crypto among yearlings 12/1148 (1%) shedding Crypto among adults 2000, Atwill et al., Equine Vet Journal, packstock animals 0/305 Crypto 14/305 (14%) Giardia, infection in corrals with high animal density
10 Dana Meadows Yosemite National Park
11 N Actual measure of fecal deposition from stock Glen Aulin Sunrise Vogelsang
12 Sunrise 1000 ft gain Vogelsang 1200 ft gain Pack Station Glen Aulin 700 ft drop
13 Sunrise Trail every other 2000 ft
14 Trail to Sunrise, 2003 Lb. feces / stock / 1000 ft trail Transect
15 0.5 Fecal deposition along Sunrise Lbs of feces per stock per 1000 ft of trail Transect (every other 2000 feet)
16 Glen Aulin Trail every other 1400 ft
17 Fecal deposition along Glen Aulin Lbs of feces per stock per 1000 ft of trail Transect (every other 1400 feet)
18 Vogelsang Trail every other 2000 ft
19 Fecal deposition along Vogelsang Lbs of feces per stock per 1000 ft of trail Transect (every other 2000 feet)
20 Fecal deposition averages from 0.1 to 0.6 lbs, usually less than 0.2 lbs / stock / 1000 ft trail
21 What options are there for encouraging stock to defecate & urinate prior to entering a stream?
22 Crypto and Giardia infection 2001 sampled ~80 stock for 5 weeks, 371 fecals Crypto-DFA 0/371 (0%) Giardia 2/371 (0.5%) 2002 sampled ~100 stock for 11 weeks, 379 fecals Crypto-DFA 1/379 (0.3%) 220 oocysts / lb feces Crypto-IMS 1/73 (1.4%) 600 oocysts / lb feces Giardia 23/379 (6.1%) 700,000 cysts / lb feces 2003 sampled ~120 stock for 11 weeks, 537 fecals Crypto-DFA 0/537 (0%) Crypto-IMS 0/182 (0%) Giardia 14/537 (2.6%) 6,000 cysts / lb feces
23 ALL 3 Years 1,287 fecals Cryptosporidium parvum 6/1287 (0.5%) 2 oocysts / lb feces Giardia duodenalis 39/1287 (3%) 240,000 cysts / lb feces 0.2 lbs feces per stock per 1000 ft of trail 0.4 oocysts & 50,000 cysts
24 Belding s ground squirrels, or picket pins (Spermophilus beldingi) wildlife contributions to backcountry pathogens
25 Tuolumne Meadows Trap Location, 2003 Stable
26 Cryptosporidium infection in Belding s ground squirrels Tuolumne and Dana Meadows, 2003 Prevalence Oocysts / g feces Adults 15% (42/284) 140,000 Juveniles 42% (84/199) 2,200,000 Overall 26% (126/483) 880,000 Most isolates are a new species of Cryptosporidium with no history of human infection, but 5% appear similar to C. parvum
27 Environmental loading of Cryptosporidium by Belding s ground squirrels, 2003 Mean body weight = 196 g (0.5 lb) Defecate ~2% body weight per day 1 squirrel produces 100,000 s oocysts / day Density ranged from 5 to 20 squirrels / acre 1 to 10 million oocysts / acre / day in Tuolumne and Dana meadows
28 Comparative loading of Cryptosporidium oocysts Adult horse (1000 lb) : Mean daily fecal production ~ 40 lb 2 oocysts / lb 40 lbs feces = 80 oocysts / horse / day Belding s ground squirrel (0.5 lb): Mean daily fecal production ~ 0.01 lb 25 million oocysts / lb 0.01 lb feces = 250,000 oocysts / squirrel / day 1 squirrel equals ~ 3000 horses!
29 What is the density of stock? What is the density of ground squirrels? 100:1 squirrels to stock in Tuolumne and Dana Meadows, or more?
30 Marmots (Marmota flaviventris) and Cryptosporidium parasites in the high Sierras, 2012
31 1 Yosemite NP 2 Little Lakes Valley 3 Courtright Reservoir 4 Chocolate Lakes 5 Clover Creek 6 Gilbert Lake 7 Mineral King 8 Cottonwood Lakes 33/224 (15%) fecals test positive mean of 1500 to 5000 oocysts / g only 2 isolates DNA confirmed C. parvum
32 Developing beneficial management practices (BMPs): 1 goal is to match pathogen flux with local BMP efficacy Key processes driving waterborne zoonotic transmission A. Vertebrate pathogen loading: who sheds the pathogen? B. Hydrological transport: how are pathogens reaching water? C. Inactivation kinetics: can the pathogen survive long enough? D. Inter-species infectivity: is the pathogen infectious for humans?
33 CA statewide survey of 20 cow-calf herds, Butte, Contra Costa, Humboldt, Kern, Lassen, Madera, Modoc, Mono, San Joaquin, San Luis Obispo, Solano, Stanislaus, Tulare and Yuba County (14 counties), 1412 cows and calves Prevalence (%) of fecal shedding (positive/total) Salmonella E. coli O157 Cryptosporidium sp. Giardia duodenalis Cow 0.4% (3/726) 5% (37/726) 9% (67/726) 23% (168/726) Calf 0.15% (1/686) 5% (35/686) 20% (136/686) 42% (286/686) TOTAL 0.3% (4/1412) 5.1% (72/1412) 14.4% (203/1412) 32% (454/1412)
34 Cryptosporidium from CA beef cattle in this study appear to have low to no infectivity for humans C. andersoni C. bovis C. ryanae C. parvum Cow Calf Total 1 (1.2%) 19 (23.5%) 61 (75.3%) 0 (0%) Giardia duodenalis from CA beef cattle in this study appear to have low to no infectivity for humans Assemblage E Assemblage C Unknown Cow Calf Total 184 (90%) 15 (7%) 6 (3%)
35 Does rangeland, meadow or annual grassland remove pathogens in runoff? overland flow subsurface flow
36 Sierra Foothill Research & Extension Center, University of California Buffer width (m) 0.1, 1.1, 2.1 Land slope (%) 5, 20, 35 RDM (kg/ha) 225, 560, 900, 4500
37 Take advantage of pathogen retention of rangeland and meadows. Vegetated buffers can retain >95% of key pathogens in winter and spring; >99.9% achievable with sufficient infiltration; heavy rain leads to buffer failure (T-storms in summer?)
38 A microbe s journey between two locations is subject to numerous attenuating and inactivating processes Instream filtration of pathogens: interaction with sediment and biofilms
39 2012 technical reports on waterborne pathogens and BMPs both are FREE for BCH members NRCS-USDA EPA & WHO
40 HORSES IN THE BACKCOUNTRY Setback distance & buffers at camps and corrals Dispersion of feces & solar inactivation Behavior of stock defecation & urination Corral manure mgt. and water runoff Water quality at stock and non-stock camps
41 Thank you, any questions? Mann Lake, Oregon
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