prevalence of methicillin-resistant staphylococcus aureus (mrsa) in organic and confinement swine...
DESCRIPTION
2009 PPT Presentation at ASM ESCMID Conference in London, UK.TRANSCRIPT
Abby L. Harper, MPHUniversity of Iowa
Center for Emerging Infectious Diseases
10-09-2009
Prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in organic and confinement swine
operations in Iowa and Illinois
Introduction to MRSA
Methicillin-resistant Staphylococcus aureus (MRSA)
Gram positive bacterium
Leading cause of hospital-associated infections
Image: http://trouble.philadelphiaweekly.com/archives/MRSA220207_400x379%5B1%5D.jpg
Introduction to MRSA
Not only a hospital problem anymore
Reference: NEJM 2005;352:468-75NEJM 2008;358:11.
Images: : http://www.foodpoisonblog.com/dog_cat.jpg http://agebb.missouri.edu/commag/swine/pigs.jpghttp://www.smh.com.au/ffximage/2006/07/26/cattle26706_wideweb__470x313,0.jpg
MRSA and Swine
First identified in the Netherlands, 2005
Pig farmers: higher rate of colonization with methicillin-susceptible S. aureus (MSSA) and MRSA
Reference: EID 2005;11:1965-66
MRSA and Swine
Swine-associated MRSA also found in Denmark, Germany, Austria, France, Canada
USA?
Swine MRSA in the USA?
Iowa: #1 pork producing state in the USA
16 million hogs
= 25% of hogs raised in the U.S.
= $4 billion/year
Image: http://en.wikipedia.org/wiki/Iowa
MULTI-STATE STUDY
Images: http://en.wikipedia.org/wiki/Iowahttp://en.wikipedia.org/wiki/Minnesotahttp://en.wikicpedia.org/wiki/Ohiohttp://wonkette.com/340314/ongoing-wonkette-iowa-caucus-coverage/
Multi-state study 18 farms per investigator
24 animals tested per farm
Nasal + pharyngeal sampling, humans
17 farms tested
Summary – Results in Swine
No MRSA found to date on organic farms in Iowa
Overall prevalence, swine: 45/408 (11%) Confinement swine: 45/192 (24%)
Humans: 27/86 (31.4%)
Humans working in confinement: 27/61 (44.3%)
Confirmed as ST398; first identification in US
Summary – Results in Humans
Individuals exposed to swine, especially in confinement
operations, are at risk for MRSA carriage
Images: http://brhssupplies.com/db1/00097/brhssupplies.com/_uimages/P1011023.JPGhttp://cache.daylife.com/imageserve/05C1f8NfK3eZ5/610x.jpg
Confinements as amplifiers and reservoirs
1000s of animals in small space
Ventilation systems
Low-tech environmental sampling
All but 1 grew MRSA Map created by: Abby L. HarperSources: Abby HarperIowa Geologic Survey – DNR
Follow-up Environmental Sampling PhD student in
Industrial Hygiene
Anderson impact sampler
CFUs / volume of air
May indicate MRSA particle size
Source: http://www.teagasc.ie/research/reports/dairyproduction/3989/eopr-3989.asphttp://www.pacwill.ca/en/ProductsServices/6stage.htm
Summary MRSA is present in
U.S. swine and swine workers in confinement facilities
Potential to spread to larger community
Reservoir of resistance
Image: http://cuteoverload.com/2009/04/27/pucker-up-behbeh/
Future directions
More general study of MRSA in rural Iowa
Population prevalence & strain types
Animals other than swine
Role of antibiotics?
Co-authors and team membersTara Smith (PI)
Mike Male, Anne Dressler,Blake Hanson, Shylo Wardyn (MS students)
Jennifer Kroeger (PhD student)Phil Scheibel (undergraduate)
Loreen Herwaldt MD, Dan Diekema MD (UIHC)
http://www.public-health.uiowa.edu/CEID/[email protected]