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(1)

RAPID

EPIDEMIOLOGICAL MAPPING

OF ONCHOCERCTASTS (REMO) rN SOUTHERN SI.TDAN,

MARCH t-28,2003

MISSION REPORT FOR

woRLD

HEALTH ORGANZATTON (WHO) AFRICAN PROGRAMME FOR ONCHOCERCIASIS

CONTROL (APOC)

OUAGADOUGOU,

BIIRKINA

FASO

BY Dr.

Mounkaila Noma

Chief of Epidemiology

&

Vector Elimination WHO/APOC Ouagadougou, Burkina Faso

Prof. B.E.B. Nwoke; Dr. I.N.S Dozie

&

C. M.IJ.

Ajero

WHO/APOC REMO Temporary Advisers

Imo State University Nigeria PMB 2000 OweriArligeria

March 27.2003

(2)

LIST

OF CONTENT

1.0

Summary

2.0

Introduction

3.0

Materials and Methods

3.1

Study Area

3.2

REMO Training

3.3

REMO Field Exercise

4.0

Results and discussion

5.0

References

6.0

Acknowledgements

7

.0

Appendix

7

.l

Mission Schedule

7

.2

List of Nationals Trained

7.3

REMO Data

]a

(3)

1.0 SUMMARY

Rapid Epidemiological Mapping

of

onchoc-erciasis (REMO)

*u,

.orrducted in Southe* S.rdan, March

1'

28,2003 with the

rrpport of African

Programme

for

Onchocerciasis Control

(APOC)

During

this

study, a total

of

300 villages (both

fr9*

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

exercise

was

successfully conducted or validated

in

182(60.7%)

of the

villages selected. The result showed

that orrhotttciasis was

absent

in

6(3

'3%) of

the

examined villages while

in

176(96.7%) of the villages, varying degrees of the

iir.ur.

intensity were observed. Out of the 176 vilLges positive for onchocercal nodule, 33(18'S%) had nodule rates

of 1- 9%;

4a(25 .0%) had

10-

19% nodule rates while 82(46.6%) and 17(9.7%)

had

20- 39% and

40-

100% nodule

rates

respectively.

The

integration

of the

data

into

Atlas

Geographical Information system (Atlas GIS) helped to define the

tommunity

Directed Treatment

with

Ivermectin(CDTl) priority zones, where REMO needs to be refined Or carried out as well as non-CDTI zones.

(4)

2.0 INTRODUCTION

From

the grim

background

of the

seriousness

of the

public health implications

of hu*an

onchocerciasis

and its

socio- economic impact in endemic areas,

it

became clear that

it

is no longer a disease that can be taken for granted' This encouraged

wrro

(as executing agency)

in

197

4 with

donor agencies and eleven (1

1)

endemic -countries

in West Africa to

establish

Onchocerciasis Control Programme

(OCP).

OCP, the largest

single and most successful tropical disease control programme

wal

solely based

on

aerial spraying

of

breeding sites (rivers)

with

biodegradable larvicideJ

to kill

the aquatic larvae of the flies which transmit the disease. The success story of OCP has

been reported severally

(Duke,

1990;

WHO,

1994; APOC'

2000). To

sustain

this

success, and

to

confiol the disease in other endemic country outside

the OCP

atea, global efforts continued

in

search

oi

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 presented

by the

discovery and

registrations

of

ivermectin (Mectrzan) as

a

safe and effective

mlcrofilaricide for

large-scale

(mass) oral treatment of

onchocerciasis

was a remarkable breakthrough.

This

development revolutionised the disease control strategy' Infact, repeated, annual single-dose treatment

with

Mectizan reduces

th;

development

of clinical illness, visual

impairment, disfiguring

iLin

conditions and significantly decreases vector

infeciivity, thus

reducing fiansmission (APOC,

2000). on

October

Zt,

tggg, Merk

&

Co. Inc. at a press conference took an unprecedented decision and announced

that it would

supply Mectizan free

for

the treatment

of

onchocerciasis

to

any one who needed

it, for

as long as necessary.

This

commitment,

provided

agencies, otganisations

like OCP and

endemic

countries

not only *itf,

incentive

but

also

with

formidable

challenge. This open a new chapter and opportunity; and WHO

(5)

African

Programme

for

Onchocerciasis Control (APOC) was launched ,n1ggS to take up this challenge to control the disease

in

19 endemic African countries outside the OCP area.

A

massive consortium comprised of governments

of

19 partner nations, donor countries,

WI{O,

Merk &' Co' Inc', TDR/WHO'

world

Bank, NGDOs, UNDP and

FAO all

came together to

help

established

and

support

a novel

prografiIme-APOC-to

ou"rr.,

the distribution

of

Mectizan and

to

ensure

it

reached

those populations most at

risk.

And the objective of APOC "is

to

estaUiish,

within a

period

of

12'15 years, effective, seJf-

sustainability and Community Directed Treatment

with

Ivermectin (CDTD

throughout

the

endemic areas

in

the

geographical scope of the

piogtam*e."

By this, APOC's g!!l_is

to treat 50 million

peopie

pet

year

by

2010 through CDTI

stratery (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

treatment

6 the people at the

highest

risk of

developing the most severe complications (WHO, 1995

a).

In

this 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 et

al, 1992;

WHO, tggz).

And the level

of

communrty's

risk

is directly ielated io the intensity of the disease in the community (Remme

et

a1,1989). This according to

wHo

(1992, 1995 a)

and Ngoumou &walsh (1993) is usually

determined

epidemi[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 CDTI

priority

and at the same time

ensure adequate coverage of the high risk areas.

(6)

In Southern Sudan, the first clinical observation of

onchocerciasis was made

by

Ensor

in 1908.

Ensor described

what was then known as "craw craw"

in

soldiers stationed in

Meridi in

Bahr El-Ghazal

Region.

About three decades after

Ensor,s

observation,

Bryan (1935) reported a

definite

association

of

onchocerca

volvulus

infection

with

blindness and

onchorrr.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

vectors

in 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 Baker

it

Abdeinur

(1986).

'These results though

not

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 absence

of

complete

epiOemiological information on the disease

in

Southern Sudan

till

now tras timited APOC's complete implementation of

cDTI in

all the high-risk communities.

It

is against this background

and in

,onsidetation

of the

current cease-fire

that

APOC

sponsored this study with the following objectives:

tul To

train the 3outhern Sector onchocerciasis Task Force (SSOTF) members on REMO procedures and techniques

(b) io

assist

the

Task Force conduct

REM9

exercise in selected

villages and also

appraise

and validate

the

existing REAIREMO results-that will

generate

,o-pr.hensive

epidemiological data

that will

enable

APOC delineate areas that need CDTI priority and at the

same time ensure adequate coverage

of all

the high risk

communitie s/villages.

6

(7)

3.0

MATERIALS

AND METHODS 3.1 STUDY

AREA

The study area of this mission is Southern Sudan' Southern Sudan

is

bordered

on the

west

by

Central

Africa

Republic

(CAR), on the East by Ethiopia and on the southern boundaries by oemocratic Republic of congo (DRC), Uganda and Kenya.

ti is

administratively

divided into

three regions; Equatorial Region on the South, Bahr El-Ghazal Region on the north west urrd tfrc Upper

Nile

on the north

east.

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 and

cAR.

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 the

white Nile

in Equatoria Region are

wau,

Kideopo, sue, Ibba, and

Yei rivers.

These rivers arise

from the watei

shade

or

headwaters

of

the White

Nile,

and

therefore

are

fast flowing with a lot of rapids'

These

characteristics 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 from

typical .uioforrrt in the

southern

part to

Guinea/derived Savannah in the northern area. There is a vast swampy and or

flood plain in the

Jonglei area

of the upper Nile-

Human

settlement, though seriously affected by many years of

civil

war

is

basically

rural

Farming and livestock production are the

main

occupations

of the rural

conrmunities. Exposure to infection

in

Southern Sudan is by way of village proximity to

breeding sites and occupational activities. In

endemic

(8)

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communities, both old and young are exposed to infection such that the disease prevalence gradually increases

with

advancing

age.

3.2 REMO

TRAINING

One

of

the major objectives

of this

mission was capacity building

- to

enabie the Southern Sector Onchocerciasis Task Force (SSOfp) of Sudan have a pool of well trained manpower that

will

train the Regional and County control teams as well as

possess 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 appendix

7

.2)

was trained for four days (March 1A44,2003) in Rumbek

on all aspects of the WHO recommended

Rapid

Epidemiological Mapping of Onchocerciasis

(REMO) documents (Ngormou and

walsh,

1993;

WHO,

1995

b).

In

addition, the team was exposed to the biology and ecology

of

the disease vectors, epidemiology, clinico-pathological aspects

and the

socio-economic

impacts of the

disease

on

the

population. The

team

was

also taught

the

current disease

iontrot

strategy adopted by

WHO/APOC. At

the end

of

the

theoretical 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, use

of REMO

forms,

clinical

examination and identification

of

onchocercal

nodule.

The training was very

successful.

3.3 REMO

FEILD

EXERCISE

At

the end

of

the practicum,

six

groups were formed

(with

a member

of

SSOTF as

Soup

leader)

to

carry out

field

REMO

exercise in the accessible and secure selected (REMO )villages based

on the lJN

security

advise. For

obvious logistic and

(11)

security reasons, the team to upper

Nile

region (Boma) had !o fly for

ihi, .*..tise

with a UN designated plane. Where possible

urd ,.rure,

the APOC team facilitated and supervised the field exercise. Having established the time-table, and

UN

security clearance for theirillages to be examined, adequate logistic and material supports including communication system (radio and

mobile phone), all the groups went ahead with

the

implement

tiott of the field REMO

exercise

(March

15-262, ZObf). At the end of the field exercise, the collated results were

impressive and consistent with previously

described

epidemiological patterns of the disease. There is no doubt there fore

that tfrit nbnno

exercise

in

Southern Sudan

is a

huge success, notwithstanding the inherent difficulties associated with extensive community bised-studies

in

an area under

civil

war

conditions.

4.0

RESULTS AND DISCUSSION

With the

support

of

WHO/APOC,

Rapid

Epidemiological Mapping of Onchocerciasis (REMO) was conducted in Southem Sudan,

Idarch l-28, 2003. It is

important

to

note here that REMO as an operational procedure is used to determine through

a

rapid and simple method

the

approximate distribution and

,.r..ity of

onchocerciasis in

the

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

International

GINI)

and other NGOs

in

Southern

Sudan, lggS-2002.

It

was observed that the previous REMO

exercise was relevant but the

sampled

villages

lacked

geographical co-ordinates (latitudes and longitudes) and lvere

iot- siictly

selected

in

accordance

with wHo/

REMO

procedure.

9

(12)

However, the results were consistent with

known

epidemiological and entomological data

in

Southern Sudan'

Ufft.n the

selection

of the REMO

villages

for the

present

exercise was completed,

their

geogfaphical co-ordinates were

directly

calculated using topographical maps as

the

use

of

Geographical Positioning

system

(GPS)

was prohibite{ l"

Soutlern Sudan at the

time of

the exercise. Before the field exercise, consistent results

of the

previous

REMO

exercise which colresponded

to

villages selected

in

the present 1tud.V were adoptedand validated where possible. Infact, the endemic onchocerciasis

village

used

for the

practical

was

primarily

selected to help validite the previous REMO exercise.

A total of

300 REMO villages (both from

REA

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 validated

in

182(60.7%) of the selected villages. By the present

result,

onchocerciasis

is

absent

in

6(3.3%)

of the

villages

examined

while in

176(96.770) villages, varying degrees

of

disease intensity were observed. Of the 176 vtllages positiv.

It

oncho cercal nodule, 33(18.8olo)

had nodule

rate

of l'9%;

44(25.0%)

villages had

10-19%

nodule

prevalence while

gzi+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

integrated

into Atlas

Geographical Information System (Atlas

CfSl $ig

3) and

it

was observed

to

be consistent with known epidemiological information of the disease

in

Southern Sudan. Furthermore, the same software was used to define the CDTI priority areas, no CDTI areas and where REMO should be performed

ot

refined

(Fig. 4).

From- here

it is

clear that

bnchocerciasis is endemiCin Southern Sudan but more REMO data are urgently needed

to

actually define the boundaries

of

CDTI priority zones.

10

(13)

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(15)

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'

9-24

Ensor, 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 in

Sudan. 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 - 364

Lewis, DJ(1957). Simuliidae and their relation

to

Onchocerciasis in Sudan. BulL

wHo.

16.671-67 4

tl

(16)

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 selection

of

-

communities for treatment of Onchocerciasis with ivermectin. Trop. Med. Parapitol' 43"267-270

wHo(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 Programme

for

Onchocerciasis Control (ApOC). programme document for phase 1. APOC Ouagadougou.

williams

et al (1985). Cunent distribution of onchocerciasis in

Sudan. Sudan Med. J. 2l:9'17 .

t2

(17)

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 Kenya

for their

efforts

to facilitate our mission. We

are

indebted

to the

chairman and members

of

SSOTF

for

their

support 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 of

civil 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

(18)

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 materials

o

Planning of REMO exercise (training

& field exercise)

.

Travel clearance Mar.1-8'n 2OO3

r

Departure for Lokichoggio

.

Arrival in Lokichoggio

.

Security briefing by OLS

.

Orientation of APOC and HNI team members (BY WHO)

.

Departure for Rumbek

o

Arrival in Rumbek Mar. 8-9" 2003

. nui"i"g on

REMO methods and

techniques

r

Selection of REMO villages/ (sampling of villages)

ion for field exercise Mar. 10-14'" 22003

.

Practicals

o

Field REMO exercise Mar.15-21*2003

for Nairobi

o

Dataentry, analYsis

o

Mission report

.

Planning comPletion

of

REMO in

Southern Sudan

o

Debriefing SSOTF, WH0/Southern Sudan

r

f)enarhrre of APOC team l/rer.23-29'" 2OO3

(19)

7.2

LIST

OT SSOTF

TRAINED

1.

Dr. Samson Paul Baba/SSOTF Coordinator

2.

Dr. Samuel Patti

3.

Dr. Pius Subek

4.

Dr. Angok Gordon

5.

Dr. Margarret Itto

6.

Mrs Esther Poni

7

.

Mrs. Agum Isaac

8.

Mrs. Merry LucY

9.

Mrs. Irene Mueller

10. 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 Chane

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