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A National Action Plan on TiLV in China
Jingzhen LIANG Miaomiao LINan LIN Gengjie YAN Wei FANG
Guangzhou,China Jun 2018
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Outline
1. Farmed and wild population of tilapia
2. Diagnostics
3. Surveilance: design and implementation
4. Emergency preparedness
5. TilV management and control
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1. Farmed and wild population of tilapia
◆Tilapia production:about 1.8 million tons in 2016. China has
no catch wild tilapia records.
◆Tilapia exports:about 520,000 tons in 2016
◆Farm registry
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1. Farmed and wild population of tilapia
◆Main breeding areas:
41%
20%
17%
10%8%4%
Guangdong Hainan GuangxiYunnan Fujian other provinces
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2. Diagnostics
◼ Diagnostic laboratories and competence
• Molecular detection methods:RT-PCR,RT-qPCR
• Electron microscopy
• Cell culture
• In situ hybridization
• Histopathological observation
◼ Confirming of new emerging disease is based on Koch's
Postulate
◼ Diagnostics tests
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3 Surveilance
◆Surveilance purpose:to confirm present status and to
secure early detection of TiLV
◆Populations:tilapia in farm (fingerlings and young
adults)
◆Clustering of diseases:every month for juvenile and
young adults
◆Case definition: clinical, laboratory and epidemiological
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3 Surveilance
◆Sampling:regular tilapia sampling at the monitoring sites
during the whole year
◆Disease detection:carrying out TiLV,Streptococcus detection of the collecting samples
◆Data analysis:data analysis and risk assessment according
to the test results of the detection
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4 Emergency preparedness
疫情报告Disease reporting
隔离Isolation
封锁Blocking
染疫动物处理Dealing with infected animals
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Report content
• Time and place;
• Kinds and quantity of infected animals, immunized situation,number of deaths, clinical symptoms, pathology and diagnosis
• Epidemiological situation;
• Control measures already put in place;
• Responsibility epidemic reporting unit and contact information 。
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4 Emergency preparedness
Reportingprocedures
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4 Emergency preparedness
◼ Isolation
• Separating infected farms or suspected infected farms
from healthy farms, and taking necessary measures to
cut off the transmission, to prevent the spread of the
disease.
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4 Emergency preparedness
◼ Blocking
• To cut off the transmission after the outbreak of
disease, ban people and animals from the epidemic
area and its surrounding area
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4 Emergency preparedness
◼ Division of blocking areas
• Epidemic spot: Areas of infected animals
• Epidemic area: Areas with radius of 3 km centered on
epidemic spot
• Risk area: Areas with radius of 3-5 km around epidemic
area
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4 Emergency preparedness
◼ Dealing with infected animals
• Culling of infected animals
• Treatment of infected carcasses
Burned
High temperature treatment
Buried deep
Fermentation
Disinfection by chemical treatment
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5 TilV management and control
◼ Farm-level biosecurity• Ensure the fry/fingering quality
• Reinforce the management,periodic sterilization of tools
• Maintain a reasonable stocking density
• Mixed culture and rotated culture with other species
• Timely remove the sick and dead fish
• harmless treatment of dead fish
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5 TilV management and control
◼ Movement of live tilapia• Make sure the transport equipment is clean and pollution-free
• Strengthen quarantine on imports and exports
• Other aspects: vaccine development
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Thanks for your attention!