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Foot and Mouth Disease in the Borena Plateau of
Ethiopia: Vaccination Benefit-Cost Analysis
Tariku J Beyene, BAAbegaz, TR Chibsa, CJ Pötzsch
INTRODUCTION
Foot and Mouth Disease
• Caused by virus of the genus Aphthovirus, family
Picornaviridae.
• 7 serotypes, namely: O, A, C, South African Territories (SAT)
1, SAT 2, SAT 3 and Asia1.
• It causes considerable losses of milk yield and weight gain
• disease of production.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
• FMD slows economic growth by severely limiting attractive
and international trade opportunities with the highest prices for
animal products (James and Rushton, 2002).
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
• Some seroprevalence estimates for FMD in pastoralist herds,
includes
- Orma herds in Kenya (9%), and Maasai and Sukuma herds in
Tanzania (9.5%) (Catley et al. 2004),
- Borena in Ethiopia (21%) (Rufael et al. 2008), 53.6 %
(Mekonnen et al. 2011)
Source: G. Ayelet et al, The status of FMD
in Ethiopia, The Global control of FMD - Tools, ideas and
Ideals – Erice, Italy 14-17 October 2008.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
• FMD in the pastoralists, control is given very low priority by
the policy makers.
• This status of the disease is compounded by:
- relatively high vaccine cost,
- relatively low vaccine efficacy of vaccines.
- short duration of conferred immunity.
- high mobility of pastoralists.
- Herder’s diagnosing ability is high (Rufael et al.,2008).
• It is increasingly recognized that economic analysis should
help decisions on animal disease control and that benefit-cost
analysis is a commonly used analytical framework (Rushton et
al., 1999).
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Objectives
• To estimate the benefit-cost ratio of Foot and Mouth Disease
vaccination and its sensitivity in Borena pastoral setting.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
MATERIALS AND METHODS
Study area and sample size determination
• February - October 2011 in two districts from Borena zone -
namely Arero and Miyo.
• 2 districts are selected from the existing 13 districts of the zone
based on most recent FMD outbreak history.
• In each selected districts 5 PA were randomly selected.
• From each PA about 10-12 herd owners were selected for the
participatory appraisal as ‘informants/discussants’ and 6 key
informants.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Study methodology
a. Participatory appraisal methods –
As described by Catley, (2005) and later modified by Barasa et
al., (2008) with “triangulation”.
PE methods used Information/data collected
- Focus group discussion
-Semi structured interview
- Proportional piling
-Matrix scoring
Age classification,
Benefits derived from cattle,
Major cattle diseases,
Age and purpose based herd
structure,
Disease incidences and related
Mortalities,
Market value of cattle and milk
FMD treatment and control options
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
b. Benefit-cost ratio modeling
• by modifying models developed by Barasa et al., (2008)
Mathematical equations/models/ used in the estimation of losses due to FMD.
Benefits
Mortality losses: Cmo
Losses due to acute disease affecting all age groups DG
a= G1234*Da
1234*S1234
Losses from chronic disease affecting all groups DG
c= G1234*Dc
1234*S1234
Total mortality costs: Cmo= (DG
a + DG
c )*(N)
Milk production losses: Cmi
Short term milk losses from acute FMD, recovering cases. Ca
Mi= (G4*L4*Pa
4*Mt*Md*Ms)
Long-term milk losses due to cow deaths Cd
Mi= ((L4+Pr4)*(Da
4+Dc
4))*Ml/2*Mh*Ms
Long term milk loss due to chronic FMD Cc
Mi=((L4+Pr4) - Da
4)*Pc
4*Mh*Ml/2*Ms
Milk loss costs: Cmi = (Ca
mi+Cd
mi+Cc
mi)*N
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Calf crop losses
Loss of calves from pregnant cows dying from acute disease
CLpca = (Pr
4*Pr
a*AbFMD)+ (Pr
4*Pr
a*(1-Ab4)*CdID)
Loss of calves from pregnant cows dying from chronic
disease
CLpcc = (Pr
4*Pr
c*AbFMD)+ (Pr
4*Pr
c*(1-Ab4)*CdID)
Loss due to extended calving interval in calf crop
CLECI = Pr
4*(Pa
4* (Exa/CI)) + Pc
4*(Exc/CI))
Calf crop loss, is therefore, CCL = (CLpca + CLpcc +
CLECI)*N
PENAPH technical workshop, December 11-
13, 2012, Chaing Mai, Thailand
Costs based on Kenyan vet vaccine centre, consultation with BZPDB based
on experience of currently ongoing CBPP mass vaccination.
• Cost of vaccine
• Equipments.
• Establishment of field camp.
• Cold chain and its maintenance.
• Field staff perdium.
• Supervision and management costs.
• Fuel cost for transportation.
• Contingency administrative costs.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
• In addition, sensitivity analysis was done by feeding values in
to benefit-cost model with expectation of changes in market
prices.
• The benefit-cost ratio equation models of FMD vaccination
calculated as benefit/cost.
• The data collected was entered in to MS Excel sheet spread
(Microsoft office Excel 2007).
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
RESULT AND DISCUSSION
FMD treatment and control options
• Livestock keepers commonly use traditional methods (salty
soil ’Kula’), antibiotic treatment, or simply “taking no action”.
• Most (68%) of FMD outbreaks left uncontrolled with no
action- self limit.
• All of the respondents indicated that they never vaccinated
their cattle against FMD.
• Other options like movement control seems to be difficult with
very porous borders where legal enforcement is difficult and
requires collaboration with neighboring regional states and
countries.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Incidences and mortality due to FMD
Variable Mean (%) (CI) (95%)
Overall incidence (all age groups) acute FMD 22.1 (18.8, 25.4)
Overall incidence (all age groups) chronic FMD 4.9 (2.4, 7.3)
Incidence of acute FMD G4 age group 13.3 (10.0, 16.6)
Incidence of chronic FMD G4 age group 6.6 (3.8, 9.4)
Overall mortality (all age groups) acute FMD 8.5 (7.7, 9.2)
Overall mortality (all age groups) chronic FMD 0.0 (0.0, 0.0)
Mortality due to acute FMD by age group:
Jabi/Watiye (<=1 yr)) 29.6 (22.3, 26.8)
Agoro (1-2 yrs)) 9.7 (5.5, 13.8)
Lamacha (2-4 years)) 4.3 (2.2, 6.4)
Korma Sanga/Hawicha (>=4 yrs)) 3.7 (1.8, 5.5)
Proportion of lactating cows in the herd 40.2 (33.7, 46.7)
Proportion of pregnant cows in G4 66.5 (60.2, 72.0)
Proportion of pregnant in the herd 30.7 (25.8, 35.6)
Normal calf survival rate 86.0 (81.0, 91.0)
Proportion of abortion 43.0 (31.8, 54.2)
Calving interval (month) 19.6 (14.3, 24.9)
Volume of milk loss (liters) per day per acute FMD case. 0.9 (0.7, 1.3)
Daily volume (liters) of milk produced per healthy cow. 1.35 (1.1, 1.6)
Duration (days) of reduced milk production per acute FMD case. 34.0 (22, 45)
Lactation period (days) 234 (163, 306)
Sales value of milk (USD/liter) 0.7 (0.6, 0.9)
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Summary of losses related to FMD
Summary variable Cost (USD) (% of direct loss)
Losses
Losses due to mortality:
Acute FMD 10,799,081.32
Chronic FMD 0.00
Total loss from mortality 10,799,081.32 (33.3)
Losses due to reduced milk production:
Recovering acute FMD 970,875.10
Recovering chronic FMD 3,715,226.92
Long term due to cow death 17,003,216.56
Total loss from milk reduction 21,689,318.58 (67.7)
Total value of all losses 32,488 399.90
Calf crop loss 113,379 calves
Costs
Total cost of vaccination program 3,561,870.1
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Estimated costs of biannual foot-and-mouth disease vaccination of the entire (85%) cattle
population
Item Cost (in USD)___
Vaccine cost a 3,274,153.00
Vaccination equipment 25,111.00
Cold chain equipment and maintenance 40,450.80
Field staff, supervisor and management perdium 15,077.70
Transportation 5,980.00
Establishment and support to field camp 31,484.70
Sub-total 3,392,257.28
Operational contingency of 5% 169,612.86
Total 3,561,870.14
aAssumes the use of quadrivalent FMD vaccine for serotypes SAT 1, SAT 2, A and O, and
biannual vaccination from Kenya veterinary vaccine center.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Benefit-cost and sensitivity analysis
Benefit-cost of FMD vaccination
(positive/negative proportional change relative to current field model in bracket)
Changes in disease
severity and
vaccination costs
Current
field model
Market values of cattle and milk increase by Calf crop lost
in number
25% 50% 75% 100%
Field model 9.1 11.40(25) 13.68(50) 15.96(75) 18.24(100) 113,379 calves
FMD incidence and
mortality
Reduced by 25%
Reduced by 50%
Reduced by 75%
6.05(-34)
4.03(-55)
2.02(-78)
8.55(-6)
5.71(-37)
2.86(-68)
10.26(13)
8.5(-7)
7.1(-21)
11.97(32)
7.1(-4)
7.26(-20)
13.68(51)
9.12(0)
7.47(-18)
83,578(-25)
55,725(-50)
27,943(-75)
Vaccination costs
Increased by 25%
Increased by 50%
Increased by 75%
Increased by 100%
7.30(-20)
6.08(-33)
5.21(-43)
4.56(-50)
9.12(0)
7.60(-16)
6.52(-28)
5.70(-37)
10.95(20)
9.12(0)
7.82(-14)
6.84(-25)
12.77(40)
10.64(17)
9.12(0)
7.98(-12)
14.59(60)
12.16(34)
10.42(15)
9.12(0)
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Conclusion
• Participatory techniques are very helpful to collect data for
economic analysis which is almost impossible using the
available conventional recorded data.
• FMD is a disease that causes losses associated with the death
of animal, production loss and affects people’s social as well
as economic well-being.
• The benefit-cost ratio of vaccination was found to be positive
and less sensitive to vaccination costs change.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
• It is not expected for a vaccination program to lead to a disease
free status in the region soon, but reduced calf mortality rates
and disease incidence in adult animals will lead to increased
calf survival and less impact on milk production.
• This would imply less stress on people’s lives, food security
and socio-cultural harmony.
• PE is a preferred tool to generate quantitative data for
facility and data resource poor regions/areas.
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Acknowledgments
• Tufts University/Feinstein International Center, Addis Ababa
regional office.
• Co-authors: Admassu Berhanu (Tufts), Tesfaye Rufael
(NAHDIC), Carsten Pötzsch (Vet.Epi.consultant, Germany)
• Drs A. Catley, M. Barasa, and the Borena people.
• PENAPH- ILRI, CMU-FVM
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
Thank you

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Foot and mouth disease in the Borana Plateau of Ethiopia: Vaccination benefit-cost analysis

  • 1. Foot and Mouth Disease in the Borena Plateau of Ethiopia: Vaccination Benefit-Cost Analysis Tariku J Beyene, BAAbegaz, TR Chibsa, CJ Pötzsch
  • 2. INTRODUCTION Foot and Mouth Disease • Caused by virus of the genus Aphthovirus, family Picornaviridae. • 7 serotypes, namely: O, A, C, South African Territories (SAT) 1, SAT 2, SAT 3 and Asia1. • It causes considerable losses of milk yield and weight gain • disease of production. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 3. • FMD slows economic growth by severely limiting attractive and international trade opportunities with the highest prices for animal products (James and Rushton, 2002). PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 4. • Some seroprevalence estimates for FMD in pastoralist herds, includes - Orma herds in Kenya (9%), and Maasai and Sukuma herds in Tanzania (9.5%) (Catley et al. 2004), - Borena in Ethiopia (21%) (Rufael et al. 2008), 53.6 % (Mekonnen et al. 2011) Source: G. Ayelet et al, The status of FMD in Ethiopia, The Global control of FMD - Tools, ideas and Ideals – Erice, Italy 14-17 October 2008. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 5. • FMD in the pastoralists, control is given very low priority by the policy makers. • This status of the disease is compounded by: - relatively high vaccine cost, - relatively low vaccine efficacy of vaccines. - short duration of conferred immunity. - high mobility of pastoralists. - Herder’s diagnosing ability is high (Rufael et al.,2008). • It is increasingly recognized that economic analysis should help decisions on animal disease control and that benefit-cost analysis is a commonly used analytical framework (Rushton et al., 1999). PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 6. Objectives • To estimate the benefit-cost ratio of Foot and Mouth Disease vaccination and its sensitivity in Borena pastoral setting. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 7. MATERIALS AND METHODS Study area and sample size determination • February - October 2011 in two districts from Borena zone - namely Arero and Miyo. • 2 districts are selected from the existing 13 districts of the zone based on most recent FMD outbreak history. • In each selected districts 5 PA were randomly selected. • From each PA about 10-12 herd owners were selected for the participatory appraisal as ‘informants/discussants’ and 6 key informants. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 8. Study methodology a. Participatory appraisal methods – As described by Catley, (2005) and later modified by Barasa et al., (2008) with “triangulation”. PE methods used Information/data collected - Focus group discussion -Semi structured interview - Proportional piling -Matrix scoring Age classification, Benefits derived from cattle, Major cattle diseases, Age and purpose based herd structure, Disease incidences and related Mortalities, Market value of cattle and milk FMD treatment and control options PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 9. b. Benefit-cost ratio modeling • by modifying models developed by Barasa et al., (2008) Mathematical equations/models/ used in the estimation of losses due to FMD. Benefits Mortality losses: Cmo Losses due to acute disease affecting all age groups DG a= G1234*Da 1234*S1234 Losses from chronic disease affecting all groups DG c= G1234*Dc 1234*S1234 Total mortality costs: Cmo= (DG a + DG c )*(N) Milk production losses: Cmi Short term milk losses from acute FMD, recovering cases. Ca Mi= (G4*L4*Pa 4*Mt*Md*Ms) Long-term milk losses due to cow deaths Cd Mi= ((L4+Pr4)*(Da 4+Dc 4))*Ml/2*Mh*Ms Long term milk loss due to chronic FMD Cc Mi=((L4+Pr4) - Da 4)*Pc 4*Mh*Ml/2*Ms Milk loss costs: Cmi = (Ca mi+Cd mi+Cc mi)*N PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 10. Calf crop losses Loss of calves from pregnant cows dying from acute disease CLpca = (Pr 4*Pr a*AbFMD)+ (Pr 4*Pr a*(1-Ab4)*CdID) Loss of calves from pregnant cows dying from chronic disease CLpcc = (Pr 4*Pr c*AbFMD)+ (Pr 4*Pr c*(1-Ab4)*CdID) Loss due to extended calving interval in calf crop CLECI = Pr 4*(Pa 4* (Exa/CI)) + Pc 4*(Exc/CI)) Calf crop loss, is therefore, CCL = (CLpca + CLpcc + CLECI)*N PENAPH technical workshop, December 11- 13, 2012, Chaing Mai, Thailand
  • 11. Costs based on Kenyan vet vaccine centre, consultation with BZPDB based on experience of currently ongoing CBPP mass vaccination. • Cost of vaccine • Equipments. • Establishment of field camp. • Cold chain and its maintenance. • Field staff perdium. • Supervision and management costs. • Fuel cost for transportation. • Contingency administrative costs. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 12. • In addition, sensitivity analysis was done by feeding values in to benefit-cost model with expectation of changes in market prices. • The benefit-cost ratio equation models of FMD vaccination calculated as benefit/cost. • The data collected was entered in to MS Excel sheet spread (Microsoft office Excel 2007). PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 13. RESULT AND DISCUSSION FMD treatment and control options • Livestock keepers commonly use traditional methods (salty soil ’Kula’), antibiotic treatment, or simply “taking no action”. • Most (68%) of FMD outbreaks left uncontrolled with no action- self limit. • All of the respondents indicated that they never vaccinated their cattle against FMD. • Other options like movement control seems to be difficult with very porous borders where legal enforcement is difficult and requires collaboration with neighboring regional states and countries. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 14. Incidences and mortality due to FMD Variable Mean (%) (CI) (95%) Overall incidence (all age groups) acute FMD 22.1 (18.8, 25.4) Overall incidence (all age groups) chronic FMD 4.9 (2.4, 7.3) Incidence of acute FMD G4 age group 13.3 (10.0, 16.6) Incidence of chronic FMD G4 age group 6.6 (3.8, 9.4) Overall mortality (all age groups) acute FMD 8.5 (7.7, 9.2) Overall mortality (all age groups) chronic FMD 0.0 (0.0, 0.0) Mortality due to acute FMD by age group: Jabi/Watiye (<=1 yr)) 29.6 (22.3, 26.8) Agoro (1-2 yrs)) 9.7 (5.5, 13.8) Lamacha (2-4 years)) 4.3 (2.2, 6.4) Korma Sanga/Hawicha (>=4 yrs)) 3.7 (1.8, 5.5) Proportion of lactating cows in the herd 40.2 (33.7, 46.7) Proportion of pregnant cows in G4 66.5 (60.2, 72.0) Proportion of pregnant in the herd 30.7 (25.8, 35.6) Normal calf survival rate 86.0 (81.0, 91.0) Proportion of abortion 43.0 (31.8, 54.2) Calving interval (month) 19.6 (14.3, 24.9) Volume of milk loss (liters) per day per acute FMD case. 0.9 (0.7, 1.3) Daily volume (liters) of milk produced per healthy cow. 1.35 (1.1, 1.6) Duration (days) of reduced milk production per acute FMD case. 34.0 (22, 45) Lactation period (days) 234 (163, 306) Sales value of milk (USD/liter) 0.7 (0.6, 0.9) PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 15. Summary of losses related to FMD Summary variable Cost (USD) (% of direct loss) Losses Losses due to mortality: Acute FMD 10,799,081.32 Chronic FMD 0.00 Total loss from mortality 10,799,081.32 (33.3) Losses due to reduced milk production: Recovering acute FMD 970,875.10 Recovering chronic FMD 3,715,226.92 Long term due to cow death 17,003,216.56 Total loss from milk reduction 21,689,318.58 (67.7) Total value of all losses 32,488 399.90 Calf crop loss 113,379 calves Costs Total cost of vaccination program 3,561,870.1 PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 16. Estimated costs of biannual foot-and-mouth disease vaccination of the entire (85%) cattle population Item Cost (in USD)___ Vaccine cost a 3,274,153.00 Vaccination equipment 25,111.00 Cold chain equipment and maintenance 40,450.80 Field staff, supervisor and management perdium 15,077.70 Transportation 5,980.00 Establishment and support to field camp 31,484.70 Sub-total 3,392,257.28 Operational contingency of 5% 169,612.86 Total 3,561,870.14 aAssumes the use of quadrivalent FMD vaccine for serotypes SAT 1, SAT 2, A and O, and biannual vaccination from Kenya veterinary vaccine center. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 17. Benefit-cost and sensitivity analysis Benefit-cost of FMD vaccination (positive/negative proportional change relative to current field model in bracket) Changes in disease severity and vaccination costs Current field model Market values of cattle and milk increase by Calf crop lost in number 25% 50% 75% 100% Field model 9.1 11.40(25) 13.68(50) 15.96(75) 18.24(100) 113,379 calves FMD incidence and mortality Reduced by 25% Reduced by 50% Reduced by 75% 6.05(-34) 4.03(-55) 2.02(-78) 8.55(-6) 5.71(-37) 2.86(-68) 10.26(13) 8.5(-7) 7.1(-21) 11.97(32) 7.1(-4) 7.26(-20) 13.68(51) 9.12(0) 7.47(-18) 83,578(-25) 55,725(-50) 27,943(-75) Vaccination costs Increased by 25% Increased by 50% Increased by 75% Increased by 100% 7.30(-20) 6.08(-33) 5.21(-43) 4.56(-50) 9.12(0) 7.60(-16) 6.52(-28) 5.70(-37) 10.95(20) 9.12(0) 7.82(-14) 6.84(-25) 12.77(40) 10.64(17) 9.12(0) 7.98(-12) 14.59(60) 12.16(34) 10.42(15) 9.12(0) PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 18. Conclusion • Participatory techniques are very helpful to collect data for economic analysis which is almost impossible using the available conventional recorded data. • FMD is a disease that causes losses associated with the death of animal, production loss and affects people’s social as well as economic well-being. • The benefit-cost ratio of vaccination was found to be positive and less sensitive to vaccination costs change. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 19. • It is not expected for a vaccination program to lead to a disease free status in the region soon, but reduced calf mortality rates and disease incidence in adult animals will lead to increased calf survival and less impact on milk production. • This would imply less stress on people’s lives, food security and socio-cultural harmony. • PE is a preferred tool to generate quantitative data for facility and data resource poor regions/areas. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 20. Acknowledgments • Tufts University/Feinstein International Center, Addis Ababa regional office. • Co-authors: Admassu Berhanu (Tufts), Tesfaye Rufael (NAHDIC), Carsten Pötzsch (Vet.Epi.consultant, Germany) • Drs A. Catley, M. Barasa, and the Borena people. • PENAPH- ILRI, CMU-FVM PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand
  • 21. PENAPH technical workshop, December 11-13, 2012, Chaing Mai, Thailand Thank you