animal disease control
TRANSCRIPT
Animal
Disease
Control
Training on Applied Veterinary Epidemiology and Animal Disease Diagnosis for Animal Health Research Personnel,
Central Luzon State University Science City of Munoz , Nueva Ecija, 23-27 May 2016
Noemi Diloy- Encarnacion, DVM, MVetEpiAssistant Professor 1
Cavite State UniversityDon Severino Delas Alas Campus, Indang,
Cavite
Session objectives
At the end of this topic, the participants should be able to:
• Assess the importance of localdiseases based on selected criteria;
• Distinguish prevention, control anderadication; and
• Describe the various strategies foranimal disease control.
ANIMAL DISEASE MANAGEMENT
Reduction, elimination or eradication of livestock and poultry diseases and the
prevention of the introduction or outbreak of foreign or domestic diseases.
Prevention - prevent disease occurrence
Disease control - reduction of the prevalence ofa disease to a level where it is no longerconsidered a major health and/or economicproblem
Disease elimination – near eradication stage
– WHO (1991) defines it as “reduction of prevalenceto a level below one case per million population
Eradication - total elimination of a disease
– no further cases of a disease occurring anywhere,and continued control measures are unnecessary
OIE GUIDELINES FOR OBTAINING RECOGNITION AS BEING FREE FROM AN EPIZOOTIC DISEASE
• Stage 1: Provisional Freedom from Disease– Absence of disease from the country– No vaccination
• Stage 2: Freedom from Disease– Ceased vaccination for a prescribed period– No outbreaks of the disease– Surveillance
• Stage 3: Freedom from Infection– Absence of causative agent– Preventive measures
How do you know a good disease control officer?
1. He/she knows how to make a “priority” list
2. He/she responds quickly
3. He/she can mobilize the right persons for the task: diagnose, control, and monitor disease problems.
4. He/she can control the disease with the least cost.
Choose the disease to control
Public Health Significance Impact on the livestock industry
1. What zoonotic diseases occur more frequently?
2. What zoonotic diseases cause severe sickness in humans?
3. Present mortality and morbidity rates
1. How easily is the disease transmitted from farm to farm?
2. What are the losses due to morbidity? 3. What are the losses due to mortality? 4. What are the effects on trade and
commerce?
Prioritization
• Ranking of items based on their “perceived or measured importance or significance”
• LIMITED RESOURCES
Estimate the Monetary ValueCost of disease Cost of disease
control Benefits of disease control
Costs due to mortality
costs due to morbidity
Costs associated with
treatment
Extra labor to nurse the sick
animals
Prohibition of sales of animal
products (ex. milk)
Increase in food conversion
index
Impact on trade
Diagnostic tests
Vaccines
Drugs
Travel costs
Staff costs
Vehicles
Equipment
Genetic loss due to
the slaughter policy
etc.
Benefit =
Losses due to the disease without control project
− Losses due to the disease with control project =
RATIONALE FOR ESTABLISHING A DISEASE CONTROL PROGRAM
1. the disease situation
2. disease impacts (animal and public health, food safety, food security, biodiversity and socioeconomic impact) and how these are distributed among stakeholders
3. identity, level of interest and involvement of stakeholders
Stakeholder Interest Influence/Importance Issues with the stakeholder Strategy
CVMBS, CVSU Prestige. To be recognized as a veterinary institution that is not only capable of providing quality instruction but also promoting and providing relevant research and extension activities. Indirectly a form of promotion that will attract more enrollees and thus will increase its income and budget allocation.
High Getting support from the university Contributions in implementing a control program will be recognized by local executives and public
Present a paper to the university on the program to include benefits, etc and the support university will get All activities will have the logo of the university, will be bannered as in cooperation with the university, etc.
PVO, MAO A good opportunity to promote and achieve one of their goals on safeguarding animal health from highly contagious diseases such as rabies
High Obtaining linkages Their offices will be highly recognized in the program implementation The fact that it is them who are primarily responsible in the control of animal diseases in the province or municipality and thus shall be the one initiating the project
A memorandum of understanding that shall lay out the ground rules of a positive cooperative effort. The names of their offices will be mentioned/ posted in all activities This issue will be considered/addressed in the memorandum of agreement
Collaborating Agencies (Provincial Health Officer, Animal Bite Center)
Rabies elimination in the human population
High There is a lack of mutual understanding of and accounting for differences in individual agency missions, of objectives and in the case of the health sector, differences in the approach of disease prevention, detection and control, and of the full range of impacts of disease control efforts in animal and human health.
Formulate efficient communication system by
bringing the heads of these agencies together to develop a shared goal for an integrated, coordinated disease control program and to define the roles of each collaborating agency
CONTROL PROGRAM GOALS
• desired results or impacts that a control program envisions, plans and commits to achieve
“As is”
situation
“To be” situation
Control Program
a. Improve control of swine respiratory diseases in Bulacan
b. Control and management of surra in the Philippines
CONTROL PROGRAM OUTCOME, OUTPUTS, ACTIVITIES
Outcome ___________
Output 1. ___________ Activity 1.1. __________ Activity 1.2. __________
Output 2. ___________ Activity 2.1. __________ Activity 2.2. __________
Output 3. ___________ Activity 3.1 __________
Etc.
NOUN/ADJECTIVES
Brief statement describing the change that the program is expected to generate in a target group
at a specified time
Something accomplished
Something to be done
VERBS OR ADVERBS
Examples:
Outcome: The strategy program envisions the Philippines to control and manage surra by 2025 such that
incidence would be nearly 0 by that date.
Expected Output: 1. Greater understanding on the epidemiology of surra
Corresponding Activities:
1. Training on surra surveillance
2. Conduct surveillance to establish true prevalence of surra.
• Vaccination coverage of 80% of dog population– Establish vaccination SOPs/guidelines
– Form teams and brief on SOPs and guidelines
– Inform public about dog rabies vaccination
– Etc…
• Increased level of awareness on rabies based on established parameters– conduct a knowledge, attitudes, practices survey of
the community folks on rabies
– analyze the results
– develop IEC campaign based on the KAP survey
– Implement IEC campaign
RISKS and ASSUMPTIONS
• plan for them and to mitigate their impact on the project
Figure 1: Risk Matrix
Risk Impact Probability Mitigation
1.
2.
Assumptions are the conditions needed to achieve results after the risks have been managed
Determinants
• factors or events that are capable of bringing about a change in health
• Influencing factor or characteristic
– introduction, development, and spread of disease and other health-related conditions within and between animals
• On-Farm Biosecurity - measures adopted to keep diseases out of herds where they do not currently exist
– Isolation of new animals brought to the farm
– Restriction on movement of people, animals, and equipment
– Use of safe feeds- Swill feeding can be dangerous
– Hygiene. Effective combination of cleaning and disinfection
Border controls
– border entry/exit screening
• National, provincial, municipal, farm levels
– Quarantine
– Isolation
– Public awareness
Regulation of Importation
• Pre-export testing, Quarantine and Animal Health Certification
• Post-arrival inspection, testing and quarantine
Proper Disposal of Wastes
Ex:
• Ebola
– On-Site Inactivation
• Appropriate autoclaves,
– On-Site Incineration
• Environmental Compliance Certificate (DENR-EMB)
VaccinationPurposes:
• To prevent disease establishment– employed if there is an imminent or sustained threat
of the disease arriving
– what proportion of the susceptible population is vaccinated (ex: herd immunity)
• To slow the spread of disease– undertaken in an attempt to prevent more animals
becoming infected, thereby slowing or stopping the geographic spread of the disease
Herd Immunity
>> form of indirect protection from infectious disease that occurs when a large percentage of a population (70-80%) has become immune to an infection
>> providing a measure of protection for individuals who are not immune
• Ring vaccination – animals surrounding an infected farm are vaccinated
• Blanket vaccination - vaccination of all susceptible species/animals over a larger area
Vaccination Tips• Choose the safe and correct antigenic type.
• Maintain vaccine quality- no contamination, potency, etc.
• Follow the recommended vaccination coverage (preferably 70 %)
• Mark vaccinated animals
• Monitor proper storage temperatures for vaccines
• Organize trained personnel into “clean” and “dirty” teams
• Remember that gathering different herds together in one vaccination station maybe convenient but dangerous.
• Count your needles and bottles before and after vaccination.
Strategies to reduce the magnitude of existing disease
• case finding & isolation• contact tracing & quarantine• “Resting” of farm or premises- length is not less than
the survival time of the pathogen. • Slaughter of susceptible animals • Closure of livestock markets and other congregations
of susceptible species (e.g. livestock auction markets, race meetings and livestock exhibit/shows)
• Removal of animals from areas with high insect population
• Treatment, medication
Zoning and Compartmentalization
• Procedures defining subpopulations of distinct health status within an area.
• Disease control, international trade
Zoning subpopulation defined primarily on a geographical basis (using natural, artificial or legal boundaries)
Compartmentalization subpopulation defined primarily by management and husbandry practices related to biosecurity
STAMPING OUT
• Destruction (quick and humane) of large number of animals
• Serious risk of further spread of disease
– animals in the infected zone are not well controlled
– spillover to feral animals
– inadequate resources are available for surveillance and imposition of quarantine and controls
– public health risk