RAPID
EPIDEMIOLOGICAL MAPPING
OF ONCHOCERCTASTS (REMO) rN SOUTHERN SI.TDAN,MARCH t-28,2003
MISSION REPORT FOR
woRLD
HEALTH ORGANZATTON (WHO) AFRICAN PROGRAMME FOR ONCHOCERCIASISCONTROL (APOC)
OUAGADOUGOU,
BIIRKINA
FASOBY Dr.
Mounkaila NomaChief of Epidemiology
&
Vector Elimination WHO/APOC Ouagadougou, Burkina FasoProf. B.E.B. Nwoke; Dr. I.N.S Dozie
&
C. M.IJ.Ajero
WHO/APOC REMO Temporary AdvisersImo State University Nigeria PMB 2000 OweriArligeria
March 27.2003
LIST
OF CONTENT1.0
Summary2.0
Introduction3.0
Materials and Methods3.1
Study Area3.2
REMO Training3.3
REMO Field Exercise4.0
Results and discussion5.0
References6.0
Acknowledgements7
.0
Appendix7
.l
Mission Schedule7
.2
List of Nationals Trained7.3
REMO Data]a
1.0 SUMMARY
Rapid Epidemiological Mapping
of
onchoc-erciasis (REMO)*u,
.orrducted in Southe* S.rdan, March1'
28,2003 with therrpport of African
Programmefor
Onchocerciasis Control(APOC)
Duringthis
study, a totalof
300 villages (bothfr9*
REA and REMO ZOOr; were selected.
out
of this,ll8(39.3%)
of them were either inaccessible and/ or insecure at the time
of the study. REMO
exercisewas
successfully conducted or validatedin
182(60.7%)of the
villages selected. The result showedthat orrhotttciasis was
absentin
6(3'3%) of
theexamined villages while
in
176(96.7%) of the villages, varying degrees of theiir.ur.
intensity were observed. Out of the 176 vilLges positive for onchocercal nodule, 33(18'S%) had nodule ratesof 1- 9%;
4a(25 .0%) had10-
19% nodule rates while 82(46.6%) and 17(9.7%)had
20- 39% and40-
100% nodulerates
respectively.The
integrationof the
datainto
AtlasGeographical Information system (Atlas GIS) helped to define the
tommunity
Directed Treatmentwith
Ivermectin(CDTl) priority zones, where REMO needs to be refined Or carried out as well as non-CDTI zones.2.0 INTRODUCTION
From
the grim
backgroundof the
seriousnessof the
public health implicationsof hu*an
onchocerciasisand its
socio- economic impact in endemic areas,it
became clear thatit
is no longer a disease that can be taken for granted' This encouragedwrro
(as executing agency)in
1974 with
donor agencies and eleven (11)
endemic -countriesin West Africa to
establishOnchocerciasis Control Programme
(OCP).
OCP, the largestsingle and most successful tropical disease control programme
wal
solely basedon
aerial sprayingof
breeding sites (rivers)with
biodegradable larvicideJto kill
the aquatic larvae of the flies which transmit the disease. The success story of OCP hasbeen reported severally
(Duke,
1990;WHO,
1994; APOC'2000). To
sustainthis
success, andto
confiol the disease in other endemic country outsidethe OCP
atea, global efforts continuedin
searchoi
complementary strategy for the disease control.Recent years have seen considerable progress in the control
of
human onchocerciasis and the dramatic change of emphasis in
strategy. The
opportunity presentedby the
discovery andregistrations
of
ivermectin (Mectrzan) asa
safe and effectivemlcrofilaricide for
large-scale(mass) oral treatment of
onchocerciasis
was a remarkable breakthrough.
Thisdevelopment revolutionised the disease control strategy' Infact, repeated, annual single-dose treatment
with
Mectizan reducesth;
developmentof clinical illness, visual
impairment, disfiguringiLin
conditions and significantly decreases vectorinfeciivity, thus
reducing fiansmission (APOC,2000). on
October
Zt,
tggg, Merk&
Co. Inc. at a press conference took an unprecedented decision and announcedthat it would
supply Mectizan freefor
the treatmentof
onchocerciasisto
any one who neededit, for
as long as necessary.This
commitment,provided
agencies, otganisationslike OCP and
endemiccountries
not only *itf,
incentivebut
alsowith
formidablechallenge. This open a new chapter and opportunity; and WHO
African
Programmefor
Onchocerciasis Control (APOC) was launched ,n1ggS to take up this challenge to control the diseasein
19 endemic African countries outside the OCP area.A
massive consortium comprised of governmentsof
19 partner nations, donor countries,WI{O,
Merk &' Co' Inc', TDR/WHO'world
Bank, NGDOs, UNDP andFAO all
came together tohelp
establishedand
supporta novel
prografiIme-APOC-toou"rr.,
the distributionof
Mectizan andto
ensureit
reachedthose populations most at
risk.
And the objective of APOC "isto
estaUiish,within a
periodof
12'15 years, effective, seJf-sustainability and Community Directed Treatment
withIvermectin (CDTD
throughoutthe
endemic areasin
thegeographical scope of the
piogtam*e."
By this, APOC's g!!l_isto treat 50 million
peopiepet
yearby
2010 through CDTIstratery (APOC, 200b).
-
Furthermore,
in
selected and isolated foci,IpOC
aims to eradicate the vector, wherever possible, by using environmentally safe methods (WHO, 1996)'From its inception, the philosophy of APOC has been to provide
Mectizan
treatment6 the people at the
highestrisk of
developing the most severe complications (WHO, 1995
a).
Inthis conc.!t,
th.
general agreement is that ivermectin should be distributed first tJcommunities that are atrisk of developing the severe and disabling ocular and dermal complications (Taylor etal, 1992;
WHO, tggz).
And the levelof
communrty'srisk
is directly ielated io the intensity of the disease in the community (Remmeet
a1,1989). This according towHo
(1992, 1995 a)and Ngoumou &walsh (1993) is usually
determinedepidemi[logically
using Rapid
Epidemiological Mapping _of
onchocerciasis
(ngrr,rol In view of the
foregoing, APOC requires comprehensive epidemiological data on onchocerciasis using the WHO ,e.ommended REMO from all APOC countries for effective GDTI strategy. The REMO data help to delineate the areas lzones that need CDTIpriority
and at the same timeensure adequate coverage of the high risk areas.
In Southern Sudan, the first clinical observation of
onchocerciasis was made
by
Ensorin 1908.
Ensor describedwhat was then known as "craw craw"
in
soldiers stationed inMeridi in
Bahr El-GhazalRegion.
About three decades afterEnsor,s
observation,Bryan (1935) reported a
definiteassociation
of
onchocercavolvulus
infectionwith
blindness andonchorrr.ul skit
diseases. Infact, Bryant called oncho- blindness,"Jur
blindness" because the disease was prevalent between the Jur and the Balanda near the Jur river tributaries.Since these initial studies, other works identified onchocerciasis
and its
vectorsin the different parts of
Southern Sudan,including
Kirk (|g37),Lewis
(1957), Haseeb et al (1962), Satti (1985),iVittiu*r
et al (1985), Kaneene at al (1985), and Bakerit
Abdeinur(1986).
'These results thoughnot
coordinated showed that onchocerciasis and its vector species are prevalent and widespread in Southern Sudan.However, there are alot of more areas where the prevalence and distribution of onchocerciasis is yet unknown. Furthermore, the available dataare not comprehensive enough to give the needed spatial distribution
of
the disease. The absenceof
completeepiOemiological information on the disease
in
Southern Sudantill
now tras timited APOC's complete implementation ofcDTI in
all the high-risk communities.It
is against this backgroundand in
,onsidetationof the
current cease-firethat
APOCsponsored this study with the following objectives:
tul To
train the 3outhern Sector onchocerciasis Task Force (SSOTF) members on REMO procedures and techniques(b) io
assistthe
Task Force conductREM9
exercise in selectedvillages and also
appraiseand validate
theexisting REAIREMO results-that will
generate,o-pr.hensive
epidemiological datathat will
enableAPOC delineate areas that need CDTI priority and at the
same time ensure adequate coverage
of all
the high riskcommunitie s/villages.
6
3.0
MATERIALS
AND METHODS 3.1 STUDYAREA
The study area of this mission is Southern Sudan' Southern Sudan
is
borderedon the
westby
CentralAfrica
Republic(CAR), on the East by Ethiopia and on the southern boundaries by oemocratic Republic of congo (DRC), Uganda and Kenya.
ti is
administrativelydivided into
three regions; Equatorial Region on the South, Bahr El-Ghazal Region on the north west urrd tfrc UpperNile
on the northeast.
Each region is divided into counties (Fig 1,2).The major topographical feature of Southern Sudan is the White Nile
*t
lch constitutes the main drainage system. It transverses the three regions from the southern border with Uganda, DRC andcAR.
In the Upper Nile region, the main tributaries of the White Nile are; Baro, Pibot, Bahr El-Jebel rivers; in the Bahr El Gazal,the main rivers are the Jur,Kiir,
Pongo, and Chel while the main tributaries of thewhite Nile
in Equatoria Region arewau,
Kideopo, sue, Ibba, andYei rivers.
These rivers arisefrom the watei
shadeor
headwatersof
the WhiteNile,
andtherefore
arefast flowing with a lot of rapids'
Thesecharacteristics create favourable breeding sites for the Simulium vectors.
The climate
of
Southern Sudan is tropical with average annual temperature of about 29C (about85F). The rainy season months are April-September with annual rainfall of more than 1000 mm(a0 inches). In
Southern Sudan, the vegetation varies fromtypical .uioforrrt in the
southernpart to
Guinea/derived Savannah in the northern area. There is a vast swampy and orflood plain in the
Jonglei areaof the upper Nile-
Humansettlement, though seriously affected by many years of
civil
waris
basicallyrural
Farming and livestock production are themain
occupationsof the rural
conrmunities. Exposure to infectionin
Southern Sudan is by way of village proximity tobreeding sites and occupational activities. In
endemic.LI I
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with
advancingage.
3.2 REMO
TRAINING
One
of
the major objectivesof this
mission was capacity building- to
enabie the Southern Sector Onchocerciasis Task Force (SSOfp) of Sudan have a pool of well trained manpower thatwill
train the Regional and County control teams as well aspossess the capacrtylo continue successful REMO exercise in
u.tut
that are inaccessible or insecure at the time of the present exercise. To achieve this, a26-man SSOTF team (see appendix7
.2)
was trained for four days (March 1A44,2003) in Rumbekon all aspects of the WHO recommended
RapidEpidemiological Mapping of Onchocerciasis
(REMO) documents (Ngormou andwalsh,
1993;WHO,
1995b).
Inaddition, the team was exposed to the biology and ecology
of
the disease vectors, epidemiology, clinico-pathological aspects
and the
socio-economicimpacts of the
diseaseon
thepopulation. The
teamwas
also taughtthe
current diseaseiontrot
strategy adopted byWHO/APOC. At
the endof
thetheoretical training at Rumbek, all the team members were taken to a known endemic community, Wulu in the Lakes County for
a
one day intensive practical (March 15,2003) on community mobilisation, useof REMO
forms,clinical
examination and identificationof
onchocercalnodule.
The training was verysuccessful.
3.3 REMO
FEILD
EXERCISEAt
the endof
the practicum,six
groups were formed(with
a memberof
SSOTF asSoup
leader)to
carry outfield
REMOexercise in the accessible and secure selected (REMO )villages based
on the lJN
securityadvise. For
obvious logistic andsecurity reasons, the team to upper
Nile
region (Boma) had !o fly forihi, .*..tise
with a UN designated plane. Where possibleurd ,.rure,
the APOC team facilitated and supervised the field exercise. Having established the time-table, andUN
security clearance for theirillages to be examined, adequate logistic and material supports including communication system (radio andmobile phone), all the groups went ahead with
theimplement
tiott of the field REMO
exercise(March
15-262, ZObf). At the end of the field exercise, the collated results wereimpressive and consistent with previously
describedepidemiological patterns of the disease. There is no doubt there fore
that tfrit nbnno
exercisein
Southern Sudanis a
huge success, notwithstanding the inherent difficulties associated with extensive community bised-studiesin
an area undercivil
warconditions.
4.0
RESULTS AND DISCUSSIONWith the
supportof
WHO/APOC,Rapid
Epidemiological Mapping of Onchocerciasis (REMO) was conducted in Southem Sudan,Idarch l-28, 2003. It is
importantto
note here that REMO as an operational procedure is used to determine througha
rapid and simple methodthe
approximate distribution and,.r..ity of
onchocerciasis inthe
area andl or validate existing information and results of previous mapping exercise' This is carried out in order to provlde a rational basis for planning and implementation of cost-effective and sustainable onchocerciasis control.Against this background, on arrival at Nairobi the APOC team triO to study and appraise the historical epidemiological data on onchocerciasis from 1908 and the REMO exercise conducted by Health
net
InternationalGINI)
and other NGOsin
SouthernSudan, lggS-2002.
It
was observed that the previous REMOexercise was relevant but the
sampledvillages
lackedgeographical co-ordinates (latitudes and longitudes) and lvere
iot- siictly
selectedin
accordancewith wHo/
REMOprocedure.
9
However, the results were consistent with
knownepidemiological and entomological data
in
Southern Sudan'Ufft.n the
selectionof the REMO
villagesfor the
presentexercise was completed,
their
geogfaphical co-ordinates weredirectly
calculated using topographical maps asthe
useof
Geographical Positioning
system
(GPS)was prohibite{ l"
Soutlern Sudan at the
time of
the exercise. Before the field exercise, consistent resultsof the
previousREMO
exercise which colrespondedto
villages selectedin
the present 1tud.V were adoptedand validated where possible. Infact, the endemic onchocerciasisvillage
usedfor the
practicalwas
primarilyselected to help validite the previous REMO exercise.
A total of
300 REMO villages (both fromREA
and REMO 2003)were selected in this exercise. Out of this , 1 13(39'3%)of
them were either insecure anil or inaccessible at the time of the present
study.
REMO exercise was successfully conducted or validatedin
182(60.7%) of the selected villages. By the presentresult,
onchocerciasisis
absentin
6(3.3%)of the
villagesexamined
while in
176(96.770) villages, varying degreesof
disease intensity were observed. Of the 176 vtllages positiv.
It
oncho cercal nodule, 33(18.8olo)
had nodule
rateof l'9%;
44(25.0%)
villages had
10-19%nodule
prevalence whilegzi+o.ayi
and {t1s.7%) of the villages had 20-39s% and 40- IOO% nodule rate resPectivelY.The distribution and intensity of Onchocerciasis in the exercise
was
integratedinto Atlas
Geographical Information System (AtlasCfSl $ig
3) andit
was observedto
be consistent with known epidemiological information of the diseasein
Southern Sudan. Furthermore, the same software was used to define the CDTI priority areas, no CDTI areas and where REMO should be performedot
refined(Fig. 4).
From- hereit is
clear thatbnchocerciasis is endemiCin Southern Sudan but more REMO data are urgently needed
to
actually define the boundariesof
CDTI priority zones.
10
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5.0 REFERENCES
APOC(2000). Empowering Partnerships and communities : APOC and the fight to get rid of Aftica of River Blindness--- WHO African Programme for
Onchocerciasis Control (APOC), Ouagadougou/Burkina Faso.
Baker, RHA &Abdeinur, oM(1986). Onchocerciasis in Sudan. The distribution of the disease and its vectors.
Trop. Med. Parasitot. 37:341-355
Bryant,
-
J(1935). Endemic retino-choroiditis in Anglo-Egyptian Sudan, and its possible relation to Onchocerca volvulus.Trans. Rov. Soc. Trop. Med. Hvg' 28: 523-532
Duke, BOL(1990). Human Onchocerciasis: An overview of the Disease. Acta Leidensia.
59OeD'
9-24Ensor, H (1908). The advent of craw-craw in the Anglo-
Eryptian Sudan. J. Roy. Army Medical corp. 10:140-143 Haseeb,
MA;
satti, MH&
Sherifl M(1962). Onchocerciasis inSudan. BulL WHO 27: 609'615
Kaneene, JB et al (1985). An epidemiological study
of
Onchocerciasis in Bahr EL-Gazal province. Sudan Med' J' 2l(suPPl .): 65-71
Kirk, R (1947). Observations on onchocerciasis in the Bahr El- Gazalprovince of Sudan. Ann Trop. Med. Parasitol
4l
'357 - 364Lewis, DJ(1957). Simuliidae and their relation
toOnchocerciasis in Sudan. BulL
wHo.
16.671-67 4tl
Ngoumou, P& Walsh, JF(1993). A Manual for Rapid
Epidemiological Mapping of onchocerciasis (REMO)
TDR/TDE/ON CIJiO t 93 -4 WHO Geneva
Remme, HJ et al (1989). Ocular onchocerciasis and intensity
of
infection inthe cofirmunity.1. West African savannah.
Tron. Med. Parasitol. 40:340-347 '
Satti, MH(1985). A historical account of Onchocerciasis in
Sudan Med.J 21:5-8
Taylor, HR; Duke,
BoL &
Munoz,BC (1992). The selectionof
-
communities for treatment of Onchocerciasis with ivermectin. Trop. Med. Parapitol' 43"267-270wHo(1992).Methodsforcommunitydiagnosisof
Onchocerciasis to gUide ivermectin-based control in Africa. TDR/TDE/0NCH0/92'2, Geneva
wHo
(lgg4). Twenty years (1974-1994) of onchocerciasis control Programme in west Africa.wHo
Geneva.WHO (1995a). Onchocerciasis and its control: Report of a
wrro
Expert committee on onchocerciasis control.WHO Tech ReP. Ser. No 852
wHO
(1995b). The importance of onchocercal Skin disease:Report of a multy county study. TDR Applied Field Research RePort, No
I
Geneva'WHO
(1996). African Programmefor
Onchocerciasis Control (ApOC). programme document for phase 1. APOC Ouagadougou.williams
et al (1985). Cunent distribution of onchocerciasis inSudan. Sudan Med. J. 2l:9'17 .
t2
6.0
AKNOWLEDGEMENT
we
are grateful to APOC for the opportunity given to us to serve in thiJ exercise and to WHO Lagos, Southern Sudan and Kenyafor their
effortsto facilitate our mission. We
areindebted
to the
chairman and membersof
SSOTFfor
theirsupport and goodwill through out the study. The success of this exercise was made compaiatively easier by the expertise and professionalism as well as commitment exhibited by HealthNet international
(HNI) in
generating the REA results even in the mist ofcivil war.
The contributions of the field teams, village heads and drivers are highly appreciated. To all that contributed to the success of this study, we say thank you't3
7.0
APPENDX
7.1. MISSION SCHEDULE
AGENDA
Activities
r
Arrival of APOC Team Feb.28'n 2oa3.
Meeting with SSOTF,WHO/Southern Sudaru WHO/I(enYa.
Collection of maps, rePorts and materialso
Planning of REMO exercise (training& field exercise)
.
Travel clearance Mar.1-8'n 2OO3r
Departure for Lokichoggio.
Arrival in Lokichoggio.
Security briefing by OLS.
Orientation of APOC and HNI team members (BY WHO).
Departure for Rumbeko
Arrival in Rumbek Mar. 8-9" 2003. nui"i"g on
REMO methods andtechniques
r
Selection of REMO villages/ (sampling of villages)ion for field exercise Mar. 10-14'" 22003
.
Practicalso
Field REMO exercise Mar.15-21*2003for Nairobi
o
Dataentry, analYsiso
Mission report.
Planning comPletionof
REMO inSouthern Sudan
o
Debriefing SSOTF, WH0/Southern Sudanr
f)enarhrre of APOC team l/rer.23-29'" 2OO37.2
LIST
OT SSOTFTRAINED
1.
Dr. Samson Paul Baba/SSOTF Coordinator2.
Dr. Samuel Patti3.
Dr. Pius Subek4.
Dr. Angok Gordon5.
Dr. Margarret Itto6.
Mrs Esther Poni7
.
Mrs. Agum Isaac8.
Mrs. Merry LucY9.
Mrs. Irene Mueller10. Mr. David Bido 11. Mr. Mathew Guaso
12. Mr. Evans Ariko 13. Mr. Remijo Amule
14. Mr. Michael Luggalla 15. Mr. Emmanuel Ezama
16. Mr. Nek Martin 17. Mr. Daniel Dut
18. Mr. Cornelius Ndungu 19. Mr. Mario Deng
20. Mr. PhilliP Makuach 21. Mr. Martin Mande
22.Mr.
John Samuel Marko 23.Mr. WisleY B. Court 24. Mr. Jonathan Sebit 25. Fasil Chanel5
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