Transcript bYTEBoss
Socio-Economic Causes and Effects of Human
African Trypanosomiasis in the Democratic
Republic of the Congo
Jen Wilson
And
Silvia Escudero
http://www.icp.ucl.ac.be/~opperd/parasites.iages/tryps6.gif
The Disease
Parasitic
Transmitted by Tsetse Fly
Infects humans and cattle
Kills over 50,000 people every
year (Kabayo 2002)
http://www.gla.ac.uk/ibls/II/parasitology/cureit.ht
m
http://www.uen.org/utahlink/activities/view_activity.cgi?activity_id=30
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The Disease
Swelling occurs at site of bite.
Infection travels through blood stream.
Attacks central nervous system.
Results in swelling of brain.
Drowsiness during day; insomnia at night.
Death may occur in six months if no treatment is done (Smith
2006).
Endemicity Status
Democratic
Republic of the
Congo
http://pages.unibas.ch/diss/2004/DissB_6961.pdf
History
17th – early 20th centuries: sleeping sickness and other vectorbourn diseases caused more human deaths than all other causes
combined.
1940’s-1960’s: vector control programs, modern drugs and
insecticides led to the control of disease
Past 20 years: major epidemics and a resurgence of disease
WHY?
(Gubler 1998)
Resurgence of Sleeping Sickness in
DRC
http://www.cdc.gov/ncidod/eid/vol11no09/04-1020.htm#cit
Human Influences on Tsetse Fly
Population Growth / Urbanization
Exploitation of Land
Poor Health Policies
Climate Change
Population Growth/Urbanization
Population growth
Quick movement to urban areas
http://www.kfwentwicklungsbank.de/EN_Home/Topics/Good_Governance/index.jsp
Movement is unplanned and uncontrolled
Inadequate housing, poor waste management, dirty water, densely
packed people, etc.
Ideal conditions for tsetse fly
Kinshasa
http://www.eolc-observatory.net/global_analysis/congokinshasa.htm
Study in 2005 in Kinshasa to determine where the
greatest rate of infection was.
Results showed that peri-urban areas along rivers
had high concentrations of tsetse flies (De Deken 2005).
People move to urban places and head to rivers for
water where there is a high risk of infection.
Land Use
http://www.iaea.org/OurWork/ST/NA/NAAL/agri/ent/entTSETS
Emain.php
Tsetse flies originally found in low lands
People are increasing land use and moving to
the high lands (Eradicating Tsetse)
Farmers bring cattle with them
Cattle carry the disease and take it to tsetsefree areas.
Health Policies
1960-70’s : threat for disease decreased
Health policy decisions decreased surveillance, prevention and control.
Lack of support from developed world.
DRC uses mass screening: study in 2004 showed that the effectiveness
of testing is less than 50% (Robays 2004).
Climate Change
Not too much proof correlation.
Climate change mostly linked to human consumption.
Temperature and precipitation are most important
factors determining whether the vector can survive.
A rise in temperature could conceivably increase the
range of the vector.
http://www.solcomhouse.com/globalwarming.
htm
Effects of Disease
Depletion of Livestock
Loss of Capital
Urbanization and Economic
Degradation
Livestock
Nagana: cattle variety of disease
Kills 3 million cows a year (Pearce 2002).
Decrease in meat production and other by
products such as milk
Contributes to protein shortages in people
Farmers lose labor from the animals => poverty
http://www.iaea.org/NewsCenter/Features/Tsetse/tsetse_galler
y/pages/002.shtml
Where is the problem?
http://www.genomics.liv.ac.uk/tryps/problem.html
Capital Loss
Meeting held in Ethiopia to discuss ways to fight sleeping sickness in
2004
Experts reported that African countries lose 4.5 billion dollars every
year due to the impact of disease on agriculture (Deutsche Press 2004).
Livestock owners administer 35 million dollars worth of doses of
medication every year; each at about 1 dollar (Torr et al. 2005).
Loss of jobs
Urbanization/Economic Degradation
Fear of disease spreads and families move away from fertile
lands.
Less people on fertile lands growing crops => economic
degradation (Kabayo 2002).
Urbanization loops around and becomes a cause for increase
in annual infections.
Connections
Urbanization
S
S
Threat
Number of people exposed
S
Number of people
infected
S
Connections
S
Productivity
S
S
Animal Labor
Economy
S
S
Workforce
Vector control programs
O
Number of infected
people
O
Number of infected cows
S
S
Number of tsetse flies
References
“Cure It.” Institute of Biomedical Life Sciences. University of Glasgow. 7 April 2007 <http://www.gla.ac.uk/ibls/II/parasitology/cureit.htm>.
De Deken, Redgi. “Trypanosomiasis in Kinshasa: Distribution of the Vector, Glossina fuscipes quanzensis, and Risk of Transmission in Peri-Urban Area.”
Medical and Veterinary Entomology. 19.4 353-359 (2005). Blackwell Synergy. 6 April 2007. <http://www.blackwellsynergy.com/doi/abs/10.1111/j.1365-2915.2005.00580>.
“Democratic Republic of the Congo (Congo-Kinshasa).” The International Observatory on End of Life Care. 9 April 2007. <http://www.eolcobservatory.net/global_analysis/congokinshasa.htm>.
“Eradicating Tsetse from the Southern Rift Valley of Ethiopia.” WREN Media. 6 April 2007. <http://tc.iaea.org/tcweb/publications/factsheets/ethiopia.pdf>.
“Good Governance.” KfW Entwicklungsbank. 9 April 2007 <http://www.kfw-entwicklungsbank.de/EN_Home/Topics/Good_Governance/index.jsp>.
Gubler, D.J. “Resurgent Vector-Borne Diseases as a Global Health Problem.” Emerging Infectious Diseases. Sept. 1998. 6 April 2007.
<http://www.cdc.gov/ncidod/eid/vol4no3/gubler.htm>.
Kabayo, J.P. (2002). Aiming to eliminate tsetse from Africa. TRENDS in Parasitology, 11, 473-475.
Lutumba, Pascal. “Trypanosomiasis Control, Democratic Republic of Congo, 1993-2003.” Emerging Infectious Diseases. 11.9 (2005). Centers for Disease
Control and Prevention. 9 April 2007. <http://www.cdc.gov/ncidod/eid/vol11no09/04-1020.htm#cit>.
“Meeting Held in Ethiopia to Dscuss Ways to Fight Sleeping Sickness.” (2004). Deutsche Presse-Agentur. 7 March 2007. <http://web.lexisnexis.com/universe/>.
Opperdoes, Fred. “African Trypanosomiasis or Sleeping Sickness.” 19 Oct. 1997. 7 April 2007 <http://www.icp.ucl.ac.be/~opperd/parasites/tryps9.htm>.
Pearce, F. (2002). An atomic-powered plan to end sleeping sickness. The Boston Globe,3. Retrieved March 7,2007, from Lexis-Nexis Academic database.
References
Schmid, Caecilia. “10-Day Melarsoprol Treatment of Trypanosoma Brucei Gambiense Sleeping Sickness: From Efficacy to Effectiveness.” 21 Sept. 2004. 9 April
2007. <http://pages.unibas.ch/diss/2004/DissB_6961.pdf>.
Smith, Scott. “Sleeping Sickness.” Medical Encyclopedia. 27 Nov. 2007. Medline Plus. 7 April 2007.
<http://www.nlm.nih.gov/medlineplus/ency/article/001362.htm>.
Robays, Jo. “The Effectiveness of Active Population Screening and Treatment for Sleeping Sickness Control in the Democratic Republic of Congo.” Tropical
Medicine & International Health. 9.5 542-550. (2004). Blackwell Synergy. 6 April 2007. <http://www.blackwellsynergy.com/links/doi/10.1111%2Fj.1365-3156.2004.01240.x>.
Torr, S.J., Hargrove, J.W., & Vale, G.A. (2005) Towards a rational policy for dealing with tsetse. TRENDS in Parasitology, 11, 537-541.
“Tsetse Flies.” Entomology Unit. 2004. International Atomic Energy Agency. 9 April 2007.
<http://www.iaea.org/OurWork/ST/NA/NAAL/agri/ent/entTSETSEmain.php>.
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