#horsesa #horse #climatechate #horsehealth
Presented by Dr Gary Muscatello at the Horse SA Climate Change Workshop 2012
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Climate change and Equine Infectious Disease #horsehealth
1. Climate change and Equine
Infectious Diseases
Managing the uncertainty
Presented by Dr Gary Muscatello BVSc, PhD
Lecture, Applied Animal Microbiology
Theme Leader: Animal Biosecurity, Production
and Health
2. Outline ….
Horse- Pathogen-Environment Interaction
Climate Impact on HPEI
Disease threats
NOW !!
FUTURE ??
Adaptation to Disease Risk
Information
Strategies
4. HPEI and horse health
Temperature, land and water
Sunlight
Atmosphere
Feed and nutrients
Husbandry and housing
Other horses and other animal species
Insects
Aim of good equine husbandry is
to manipulate HPEI in favour of
the horse.
‘Equine friendly ecosystem’
Reduce host-pathogen interaction
• Pathogen bias
5. Negative climate impact
Feed and water limitation
Weather stressors
Changing weather patterns
Monsoonal rain events
Cyclonic/extreme events
Warmer and drier
Fitness
Encroachment
Insects
Irritants and pollutants
Microbes
Increase risk of specific
infectious diseases in horses
– Opportunistic
– Insect borne
– Wildlife borne
6. Climate impact and EID !!!
Reduced fitness
Heat stress
Malnutrition ?
Opportunistic disease
Drought associated diseases
Rhodococcus equi pneumonia
EAFL and MRLS
Warming
Insect borne diseases
Opportunistic bacteria and fungi
Limitation on natural resources
Encroachment diseases
Pollutants and respiratory health
COPD ??
7. Current EID events and climate
‘Rattles’
Inhalation of high concentrations of a
saprophytic bacteria called virulent R. equi
Seasonal disease of foals
Exacerbated during dry and dusty conditions
Exacerbated in Thoroughbred Industry
Intensification
Breeding regime
Hunter Valley continue to experience on-going
issues with this disease
Worsens if dry spells correspond with high
numbers of susceptible foals on the ground
8. Current EID events and climate
Equine Amnionitis and foetal loss syndrome
2004-05 Hunter Valley and SE Queensland
Mares ingesting hairy caterpillars
Moult from older larvae (Feb-April)
Pupate in soil (May)
Wind and heavy summer rains / drought breaking
Amniontis/foetal infection
Setae allow bacterial invasion
Gut microbes and soil bacteria
MRLS and nocardioform placentitis
Increase incidence of caterpillar associated
reproductive disorders in 2011 -12
Nest numbers where high during this summer !!
9. Current EID events and climate
Equine Arboviruses
Kunjin, MVE and RR virus
Typically seen in Nth Australia
Birds, rodents and macropods act as reservoirs
2011 – cyclonic weather event
Mild and wet autumn
Localized flooding
Ideal for mosquito migration and breeding
Neurological disease (Kunjin and MVE)
Sore muscles and joints (MVE and RR)
~1,000 cases ~10% case fatalities
New strain of Kunjin virus
Neuroinvasive mutant
Similar to WNV
MVE seen in Victoria 1974
10. Current EID events and climate
Hendra virus
Flying foxes reservoir host
Seen in Coastal Queensland and Northern NSW
Reduced natural food resources for bats
Urbanization of bats
Increased likelihood of bat-horse interaction
Seasonal spill-over
Stress, pregnant bats, bats giving birth
2011 – 19 incidences (14 incidence 1994-2010)
Virus is fragile.
Increased frequency of detection in bat urine
during the summer…
Mild autumn contribute to increased infectivity ??
Changes in migration patterns related to cyclonic
events ??
More bat colonies becoming infected ??
11. ‘Future’ EID events and climate
Mosquito populations
Increase in rainfall intensity
Strong wind event
Warming
Periodic migration of mosquitoes Sth
Increase frequency of arbovirus disease
Establishment of tropical mosquitoes Sth
Seasonal arbovirus disease
Increase the risk of emergence of virulent strains
Kunjin WNV (NY99)
Spread of other tropical arboviruses
Equine Infectious Anaemia
Introduction of exotic arboviruses
Japanese Encephalitis Virus
Most of SE Asia
Seen in Torres Strait
12. ‘Future’ EID events and climate
Mosquito populations
Bacterial associated insect disease
‘Pigeon fever’
Corynebacterium pseudotuberculosis
Endemic in sheep in goats in Australia
‘Cheesy gland’
Biting insects inoculating pectoral muscles with
bacteria from the soil
Spread from West coast to central and eastern U.S.
Bot fly
Tick borne diseases
15. Adaptation to Disease Risk
Understanding HPEI
Awareness of climate impact
Surveillance and monitoring
BOM !!
Sentinel animals !!
Mosquito traps !!
Horse environment !!
Breaking the connection
Strategic environmental measures
Strategic host management measures
Aim to favour the HORSE !!!
16. Adaptation to Disease Risk
Understanding HPEI
Awareness of climate impact
Surveillance and monitoring
Breaking the connection
Strategic environmental measures
Strategic host management measures
Aim to favour the HORSE !!!
17. Adaptation to Disease Risk
Understanding HPEI
Awareness of climate impact
Surveillance and monitoring
Breaking the connection
Strategic environmental measures
Strategic host management measures
Aim to favour the HORSE !!!