relations between pathogens, hosts and …...relations between pathogens, hosts and environment:...
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![Page 1: Relations between pathogens, hosts and …...Relations between pathogens, hosts and environment: joining up the dots Prof. Matthew Baylis Liverpool University Climate and Infectious](https://reader035.vdocument.in/reader035/viewer/2022062414/5ed5130488180403687e5d66/html5/thumbnails/1.jpg)
Relations between pathogens, hosts and environment:
joining up the dots Prof. Matthew Baylis Liverpool University Climate and Infectious Diseases of Animals Department of Epidemiology and Population Health Institute of Infection and Global Health, University of Liverpool [email protected]
EFSA workshop, EXPO 2015, Milan 16/10/2015
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SOURCES OF NOVEL PATHOGENS
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The bottom-up approach Bottom-up approach
ERANET ENVHEALTH PROJECT - ENHANCE
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Taxonomy DB (NCBI)
580566 ‘organisms’
Pubmed DB (NLM)
> 18 million publications
Mesh 2010 (NLM)
25588 terms
Other sources (e.g. Scopus, WOS etc.)
Programmes
Humans
ENHanCEd Infectious Diseases (EID2) database
ENHanCed Infectious Diseases Database
WWW.ZOONOSIS.AC.UK/EID2
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cat, dog,
cattle,
horse,
sheep, pig,
24 year old
male
la crosse virus
- united states
aedes
albopictus -
united states
la crosse virus
- aedes
albopictus
Data mining from NCBI
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Big Data! • 224,751 species in NCBI taxonomy database
• 39,238,061 sequences in NCBI nucleotide sequence database
• 19,717,726 sequences linked to 171,967 species
• 2,706,620 had Host tag
• 6,714,520 had Country tag
• 6,473,167 publications in PubMed database
• 6,028,487 linked to 7,463 species
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Pathogen network
Scientific Data 2, Article number: 150049 (2015) doi:10.1038/sdata.2015.4
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Why are pathogens shared?
birds
rodents
Large mammals
Are pathogens shared because:
hosts live together?
hosts are closely related?
one host eats the other?
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Transmission routes environment
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Transmission routes ingestion
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Transmission routes sexual
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It’s a funny old world
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Zoonotic pathogens [1] 1,415 human pathogens, of which
868 (61%) HUMAN PATHOGENS ARE ZOONOTIC
[2] 706 pathogens of livestock and 456 of domestic carnivores LIVESTOCK PATHOGENS: 46% INFECT HUMANS [EID2, 40%]
DOMESTIC CARNIVORE PATHOGENS: 70% INFECT HUMANS [EID2, 65%]
EID2 finds 43% of livestock/carnivore pathogens to infect humans
[1] Taylor et al (2001). Phil Trans Roy Soc B, 356, 983-989
[2] Cleaveland et al (2001). Phil Trans Roy Soc B, 356, 991-999
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DRIVERS OF DISEASE EMERGENCE
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Global richness Map of geographic origins of EID events, 1940-2004 (Jones et al, 2008, Nature)
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Drivers of [human viral] disease emergence (Based on Jones et al., 2008. Nature)
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Some drivers of animal virus re-emergence
Example Drivers
Foot-and-mouth, 2001
Feeding food waste to pigs; delayed detection of index farm; Extensive animal movements; lack of standstills; no vaccination
Avian influenza, H5N1
Viral spread from wildlife to domestic animals; extensive mixing of poultry species; extensive movements of poultry; reassortment of viruses; bird migration
Chikungunya Spread of insect vector; viral evolution; tourism & travel
Tick-borne encephalitis
Political change leading to Socioeconomic decline leading to Behavioural change; climate change?
Ebola Viral dispersal in bats; bushmeat consumption; spread by health workers; slow response time
African swine fever
Global trade and travel; Feeding food waste to pigs; extensive animal movements
Bluetongue-8 Climate change, global transport of livestock/midges/viruses
Schmallenberg Reassortment of viruses; global transport of livestock/midges/viruses
there is rarely a simple story with only one driver …….
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MODELLING SPREAD OF EMERGING PATHOGENS
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Culicoides biting midges
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Past trends in R0 - bluetongue
North-western Europe
South-western Europe
Full model (inc vector density) Reduced model (only VC)
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Spread of infection - networks
Infection spreads from farm-to-farm by three routes:
• Movement of cattle
– Cattle Tracing Scheme, 2006
• Movement of sheep – Animal Movement Licensing Scheme, 2006
• Dispersal of vectors – Non-directional (and follows a kernel!)
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Spread modelling
Blue = exposed
Red = infectious
Green = detected
Bluetongue Schmallenberg
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Climate change and BT dynamics
• Model is climate sensitive
– Temperature affects
• vectorial capacity
• vector seasonality
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Simulating effect of temperature change
-
3°C
-
2°C
-
1°C
+1°C
+2°C
+3°C
Baseline (2006)
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Conclusions
• Animals are a major source of human pathogens – but we have poor knowledge of the pathogens they harbour
• Big Data approaches can help identify new patterns
• Pathogen networks indicate that pathogens are shared with close relatives, co-habitants and predator/prey
• Many factors drive the emergence of new pathogens; climate change is one
• Climate change has driven the emergence of some vector-borne diseases, such as bluetongue
• Transmission models indicate that bluetongue outbreaks will be larger under warmer climates
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Big thanks to
• Jo Turner
• Roger Bowers
• Anne Jones
• Andy Morse
• Georgette Kluiters
• Helene Guis
• Cyril Caminade