PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA
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Transcript of PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
SITUATIONAL ANALYSIS OF THE
AFLATOXIN PROBLEM IN GHANA
BY
RICHARD .T. AWUAH
KNUST
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Outline of presentation
Basic information on Afs and effects
Af challenge and some studies in Ghana
The way forward
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
EU’s Threat to ban cereals from Ghana ‘Ghana is to face a ban from exporting
commodities like groundnuts, peanut butter and cereals products to the European markets if it is unable to reduce the level of aflatoxin contamination in such commodities’
Ghanaian Times, 14th May 2015 Edition
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE 2015
What are Aflatoxins (Afs)?• Toxic secondary metabolites of fungal origin
(Mycotoxin)
• 25% of world food crops are affected
• Countries that are situated between the 40 ºN and 40 ºS are most at risk
• Aspergillus section Flavi group A. flavus Link ex Fries A. parasiticus Speare A. nomius Kurtzman• Aflatoxin- A. flavus toxin
A. flavus
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Types of AfsB1 - A. flavus, A. parasiticus
and A. nomius
B2 - A. flavus, A. parasiticus and A. nomius
G1 - A. parasiticus and A. nomius
G2 - A. parasiticus and A. nomius
Most potent - AF B1
Other AFs
M1, B2a, M2, Q1, G2a
Kwame Nkrumah University of Science and Technology
Factors affecting Af ContaminationN
Pre harvest Post harvest
Improper dryingStorage in poorly ventilated
warm environmentsDamage during shellingStorage in polyethylene bagsStorage insects (Caryedon
serratus; Sitophilus zea mays)
Stress (Warm, dry periods; soil moisture stress)
Mechanical damage (Cultivation, damage by arthropods, birds, rodents nematodes etc)
Delayed harvestingPlanting time (Early vs. Late)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Some common AF substrates • Groundnut • Maize • Beans• Smoked fish• Kenkey• Groundnut paste• Tiger nut• Tree nuts
• Breast milk (human, cattle)• Smoked fish/fresh pond-raised
fish• Meats• Sorghum• Copra• Cheese• Black pepper• Donkwa
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Other substrates
• Faeces• Urine• Human semen• Human blood• Maternal plasma samples
Kwame Nkrumah University of Science and Technology
Af permissible levels in foods
Kenya 10 µg/kg
Nigeria 4 µg/kg
Ghana 20 µg/kg (raw groundnut)
4 µg/kg (groundnut butter)
Zambia 10 µg/kg (cereals, g’nut, nuts)
Malawi 5 µg/kg (cereals, g’nut, nuts)
Zimbabwe 5 µg/kg (cereals, g’nut, nuts)
Egypt 10 µg/kg (cereals, g’nut, nuts)
FAO and WHO 30 µg/kg
EU countries 4 µg/kg (total AF)
2 µg/kg (AF B1)
USA 20 µg/kg (all foods except milk)
USA 4 µg/kg (milk)
Codex Standard 10 µg/kg (all processed foods)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Af and healthImpaired biochemical
processes • Lipid metabolism
(cholesterols)• Glucose metabolism
(hyperglycaemia)• Mineral absorption
Afs also impair:• Growth rate• Female reproductive
efficiency• Male reproductive
efficiency• Immune system
efficiency
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Some human studies
• Correlation between serum AF levels and liver cancers• Correlation between AF intake
and Hepatitis B in liver cancer incidence• Aflatoxicoses in humans
• Aflatoxins and kwashiokor• Aflatoxin and human male
sterility problems
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Implications for food security It is an agricultural issue in the
sense that:
• Contaminated foods should not be eaten nor fed to livestock.
• Presence of aflatoxigenic fungi in staple foods contributes to decay and dry matter loss
• Impacts negatively on food security by affecting all four food security pillars i.e. availability, access, utilization and quality.
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Af contamination : An export trade issuei. Affects the potential of countries to engage in the
export trade
ii. AF levels in cereals and legumes and their products and other food items in Ghana are far above the EU and USA permissible standards of 4 and 20ug/kg, respectively. This means that many food and food items from Ghana will not be allowed into the EU and USA and perhaps many other foreign markets
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
AF and groundnut trade
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
The Ghanaian situation
Groundnut samples in Accra – 69% highly contaminated with AF (Beardwood 1964)
Kwame Nkrumah University of Science and Technology
Northern groundnut Volta groundnut
Local market
Average of five samples(μg/kg)
Range of five samples(μg/kg)
Average of five samples(μg/kg)
Range of five samples(μg/kg)
Makola 13 3 - 27 42 14 - 100
Kaneshie 12 4 - 22 50 13 - 99
Salaga 28 3 - 88 78 15 - 141
Adabraka 33 5 - 71 59 10 - 116
Teshie 26 5 - 58 69 10 - 187
Nungua 27 10 - 47 67 27 - 145
Madina 41 5 - 133 86 10 - 216
Aflatoxin levels (μg/kg) in Northern and Volta types of groundnut sold in various markets in Accra.
Source: Mintah & Hunter (1978)
Kwame Nkrumah University of Science and Technology
Location of market % Damaged kernels
Total aflatoxin levels (μg/kg)
Damaged kernels Undamaged kernelsAccra 5.3 75.6 NDAshaiman 9.25 12.2 NDMankessim 2.87 17.7 0.2Cape Coast 3.87 860.6 1.4Koforidua 2.37 5.7 0.1Takoradi 4.3 13144.3 NDKumasi 3.2 105.0 0.4Ho 5.92 22168.0 NDSunyani 2.33 54.2 NDTekyiman 3.31 5530.1 NDTamale 1.5 71.4 0.5Wa 2.92 14.5 NDNavrongo 2.0 3505.2 154.2Bolgatanga 1.67 301.8 12.2
Av. 3.6 Av. 3276 Av. 12.1
Aflatoxin levels in damaged/mouldy and undamaged/wholesome groundnut kernels from markets in the ten regions in Ghana
Source: Awuah & Kpodo (1996)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Maize samples in Ghana – 80% with AF > 30 µg/kg (Kpodo and Halm, 1990)
31 of 32 fermented dough samples – up to 310 µg/kg AF (Kpodo et al.,1996)
15 of 16 Ga Kenkey samples – up to 200 µg/kg AF (Kpodo et al.,1996)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Relatively lower levels detected in Rice - < 2µg/kg
Cocoa cake - < 8µg/kg
Agushie - < 15µg/kg (Kpodo, 2005)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Afs in Ghanaians
Af detected in human breast milk and maternal blood samples (Lamplugh and Hendrickse, 1988)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Afs in Ghanaians (Cont’d)
AFB1measured in 140 blood samples
High AFB1– 0.12 - 3 pmol/mg (Median – 0.80 pmol/mg)
AFM1measured in 91 urine samples ND – 11,562.36 pg/mg (Median – 472.7pg/mg)(Jolly et al., 2006)
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Significantly higher levels of AFB1 were from participants with symptoms of acute aflatoxicosis, history of yellow mouth and history of sore swollen stomach.
30-40% of the study group had abnormal liver function and also HBV and HBC infections
Poor liver function was positively correlated with AFB1 levelsHBV was positively associated with high AFB1 levels whereas HCV
was marginally associated with AFB1 levels andApproximately 20% of participants were positive for malaria
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
Conclusion from the study High AFB1 levels in the blood of participants, high
expression of symptoms of acute aflatoxicosis, high levels HBV/HCV infections and abnormal liver functions puts the study participants at risk of developing hepatocellular carcinoma
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Sensational report on Af in Ghana
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Sensational reports on Af in Ghana (Cont’d)
‘Scientific studies from major producing sites and
markets in Accra have concluded comprehensively that there is a widespread occurrence of the strain that causes cancer, particularly liver cancer, in Ga kenkey.’
Kofi Koomson, Ghanaian Chronicle Vol. 6, No.133
August 17- August 18, 1998
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
ARE GHANAIANS AWARE OF THE AFLATOXIN MENACE?
Kwame Nkrumah University of Science and Technology
Af awareness study
Zone Farmers Consumers Retailers Processors Feed millers
Poultryfarmers
Northern 186 149 139 106 0 0
Middle 75 159 71 76 7 25
South 70 419 162 218 11 110
Total 331 727 372 400 18 135
Total number of respondents -1984
Kwame Nkrumah University of Science and Technology
Knowledge of Afs
% o
f res
pond
ent
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Knowledge of Afs X education
RESPONDENT STAKEHOLDERS CHI SQUARE PROBABILITY
Farmer 6.003 0.20
Livestock 27.06 0.00069
Feed Millers 21.02 0.0071
Retailers 21.02 0.0071
Processors 32.29 0.00008
Consumers 37.46 0.00001
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Af awareness study - professionals
Health personnel-Medical Doctors, Nurses, Pharmacists
Agriculturist-Agricultural Extension Agents (AEAs), Regional Directors of Agriculture (RDAs), District Directors of Agriculture (DDAs), District Agriculture Development Officers (DADOs), Regional Agricultural Development Officers (RADOs), Research Scientist, University teachers
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Awareness of the terms ‘mycotoxin’ and ‘aflatoxin’
Mycotoxin
Aflatoxin
Profession No (%) Yes (%) No (%) Yes (%)
Agriculturists 37.7 62.3 17.1 82.9
Doctors 0 100 0 100
Nurses 47.5 52.5 45.8 54.2
Pharmacists 12.5 87.5 3.1 96.9
Biologists 35.3 64.7 29.4 70.6
Others 56.5 43.5 31.9 68.1
Average 31.6 68.4 21.2 78.8
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Awareness of Af accumulation in animal products Profession % Yes
Agriculturists 27.2
Medical doctors 50.0
Pharmacists 18.2
Nurses 25.4
Biological Scientists 52.9
Others 14.5
Average 31.36
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Formal training on aflatoxin and attendance of Af workshop
Formal training (%) Workshop attendance (%)
Yes (%) No (%) Yes (%) No (%)Agriculturists 15.6 84.4 7.3 92.7
Doctors 33.3 66.7 16.7 83.3
Nurses 11.9 88.1 7.3 92.7
Pharmacists 12.5 87.5 23.1 76.9
Biol. Sci. 11.9 88.1 17.6 82.4
Others 13.0 87.0 10.1 89.9
Average 16.4 83.6 13.7 86.3
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Tests of dependencies
Factor Chi square Probability
Profession X awareness of AF 103.041 0.000
Profession X awareness of effects 60.76 0.019
Qualifications X awareness 107.000 0.000
Rank of Agriculturists X awareness 103.011 0.000
Profession X what produces mycotoxin 36.991 0.008
Sex X awareness 4.504 0.342
Sex X Awareness of harmful effects humans 3.799 0.434
Profession X indication of mycotoxin 0.262 0.500
Profession X diffusion of info to colleagues 74.496 0.014
Profession X diffusion of info to subordinates 112.317 0.500
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Conclusions 2003
Though awareness of AF among some health, agricultural and other professionals in Ghana is good, the same cannot be said of the general population
This, together with the inability of most responding professionals to accurately indicate the harmful effects of Af suggests that the menace of the toxin is not well appreciated in Ghana
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Management of Af contamination
Pre harvest interventions• Planting date• Control soil insects (groundnut)• Minimize mechanical damage
during cultivation• Early harvesting• Varieties with tight fitting husks
(maize)• Resistant varieties?• Bio control (Aflasafe Ghana)
Post harvest interventions• Inverted windrow vs
random wind row drying• Drying to < 8% moisture
(g’nut); Maize (<12%)• Sorting of nuts• Preservation of shelled nuts
with plant based products
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POSTHARVEST INTERVENTIONS (Cont’d)
Storage in interlaced polypropylene and jute bags (placed on wooden platform)
Spit out off-taste kernelsAvoid market groundnut butter (homemade butter
preferable)Preservation of kernels with plant products, chemicals
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Proper drying of in-shell nuts
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Proper drying of dehusked maize
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Improper drying of shelled maize
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Improper holding of maize in transit
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Improper post harvest handling of maize
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Postharvest interventions (Cont’d)
Storage in interlaced polypropylene and jute bags (placed on wooden platform)
Spit out off-taste kernelsAvoid market groundnut butter (homemade butter
preferable)Preservation of kernels with plant products, chemicals
Kwame Nkrumah University of Science and Technology
Shelled market groundnut
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Shelled nuts in a supermarket
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Packaged nuts in a supermarket
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Packaged mouldy /weeviled nuts
Kwame Nkrumah University of Science and TechnologyR.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
GHANAIAN MEDICINAL/CULINARY PLANTS
Kwame Nkrumah University of Science and TechnologyR.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
SYZIGIUM -TREATED AND UNTREATED GROUNDNUT
Kwame Nkrumah University of Science and TechnologyR.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
Treated and untreated nuts
Kwame Nkrumah University of Science and TechnologyR.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
Kwame Nkrumah University of Science and TechnologyAssays were made at 3 and 6mn.(6 mn values are in parenthesis);IPPB= interlaced polypropylene bag: PB= polythene bag. AF before storage = 0 µg/K g
Treatment (%) Mouldy kernels AF at 3 mn (µg/Kg)
IPPB
9.0% with Syzygium 3.71 (8.26) 25.1
9.0% without Syzygium 6.73 (20.53) 36.2
6.0 with Syzygium 1.03 (4.83) ND
6.0% without Syzygium 3.24 (19.83) 27.5
PB
9.0% without Syzygium 3.39 (100) 29.3
9.0% without Syzygium 45.76 (100) 64.0
6.0 with Syzygium 1.55 (4.96) 1.6
6.0 without Syzygium 24.01 (32.63) 84.0
LSD 0.63 (0.068)
CV 2.26 (1.08)
Kwame Nkrumah University of Science and Technology
NovaSil clay enteropsorption studies in Ghana
• Afriyie-Gyawu E, Ankrah NA, Huebner HJ, Ofosuhene M, Kumi J, Johnson NM, Tang L, Xu L, Jolly PE, Ellis WO, Ofori-Adjei D, Williams JH, Wang JS, Phillips TD.• College of Veterinary Medicine and Biomedical
Sciences, Texas A&M University, College Station, TX, USA.• Noguchi
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NovaSil clay enteropsorption studies in Ghana (
NovaSil clay Processed calcium montmorillonite clay Has great affinity for Afs Binds with AFs in the GIT and decreases Af uptake in farm animals Administered at 3.0, 1.5 and 0 g/day in capsules Reduced blood and urine Afs No negative effects on vitamin A and E iron and zinc No negative effects on haematology, liver function, kidney function
and electrolytes
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NovaSil clay enteropsorption studies (Cont’d)
Side effectsNauseaDiarrheaHeartburndizziness
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Ghana Aflasafe research
Update on aflatoxin bio-control research in Ghana GHANA
2012- Visit to Ghana by a team from IITAP. Cotty; R. Bandyopadhyay; D. AgbetiamehUse of atoxigenic strains of A. flavusMechanism : Competitive exclusion
Kwame Nkrumah University of Science and Technology
From February to March - Sampling of farmers stores for maize and groundnut in major production areas Eastern, Ashanti, Brong Ahafo, Northern, Upper West, Upper East and Volta regions Purpose –i) Prevalence of aflatoxin contamination in maize and groundnut ii) Identify native atoxigenic strains of Aspergillus flavus that could be used for bio-control
2013 research
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Survey areas
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2013 research (Cont’d)
5083 isolates obtained
843 were atoxigenic strains of Aspergillus flavus
174 isolates- competition studies for potential to reduce aflatoxin production, in vitro, by a toxigenic A. flavus isolate
Kwame Nkrumah University of Science and Technology
Major findings of 2013 research
• 12 atoxigenic strains - selected for field evaluation in in 2014
• Aflatoxin inhibition - 87% – 98%
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2014 research
Preparation of preliminary aflasafe Ghana product for field testing
• Isolates (strains) were mixed to broaden efficacy • Each strain mixture was composed of 4 atoxigenic isolates; so
3 products to be tested
• So 3 aflasafe Ghana products to be evaluated in the field
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2014 research (cont’d)
• They were evaluated for their ability to reduce aflatoxin in maize and groundnut
• Determine relative efficacy of the 12 isolates to persist in soil and displace toxigenic strains of Aspergillus flavus
• Identify four best atoxigenic strains among the twelve
initial strains to prepare the final aflasafe Ghana product
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Locations of farms in 2014
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Aflasafe application in a groundnut farm in Ghana
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Aflasafe application in a maize farm in Ghana
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2015 research
Evaluate the final aflasafe Ghana product as before
Initiate ‘carry over’ studies (frequency of application)
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2016 and 2017 activities
Continue with ‘carry over’ studies Register aflasafe Ghana Product?
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Some workshops
R.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 10TH JUNE 2015
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Workshops (cont’d)
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Workshops (cont’d)
R.T. AWUAH, DEPARTMENT OF CROP AND SOIL SCIENCES, KNUST
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Workshops (cont’d) Ejura; 2014
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International meetings on Afs
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STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE 2015
Paca.pdf
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STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
The way forward
Formation of Af Platform Scoping study to identify
needsAwareness creation
(Workshops, print media, electronic media, fliers, posters, handbooks etc)
Process of change studies
Monitoring of contamination (Who is to do this? PPRSD, FDC, AEA , Farmers )
Workshop on SPSS
Sensitization on Ghana Aflasafe programme (Private sector led initiative; Gov’t to provide enabling environment )
Kwame Nkrumah University of Science and Technology
STAKEHOLDER MEETING ON INNOVATION PLATFORM ON AFLATOXIN MANAGEMENT IN GHANA: 17TH JUNE, 2015
APPRECIATIONFARAGFAPAUDIENCE
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Kwame Nkrumah University of Science and Technology