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from the general population, often referred to as community controls, or from hospitals where cases were identified. Three criteria have been proposed for the selection of controls: Controls should come from the same registry (e.g., hospital, mortality records) as the index cases. Control illness should be unrelated to the risk factors under study (i.e., a given risk factor under study should not predispose one to getting the control illness). Control illness should be similar to the illness under study, bearing in mind the factors influencing its appearance (or referral) in the registry One might want to add a second control if these criteria are not met. If farmers are under study, then ideally, the control group should also be farmers. Farming is a unique way of life, not only in terms of chemical exposure, but also with respect to diet, physical activity, exposure to viruses, habits, and life-style. Opportunity for exposure to viruses, for example, may be affected by the presence of intermediate hosts, including livestock or even particular crops. In carrying out epidemiological studies, accurate measurement of exposure is important because errors may reduce estimates of relative risk and dampen dose-response gradients. Misclassification of toxic substance increases the chance of attributing elevated cancer risk among exposed people to the wrong agent. Employment records are commonly used to assess exposure in cohort studies and interviews are used to determine exposure in case-control studies. However, these techniques are of use in both types of study and should be used, when possible, to test and improve the reliability of exposure evaluations. Information can be obtained from different sources to increase confidence in exposure estimates. Sources include suppliers who sell pesticides to the subjects under study, records of applicator companies, interviews about the type of equipment used for application, and duration and frequency of application coupled with biochemical monitoring data. For populations, estimates of exposure may be developed by a panel of experts, including agricultural scientists, entomologists, and industrial hygienists familiar with patterns of pesticide use. Biochemical factors can provide better measures of delivered dose than estimates based on concentration of substances in patches and ambient air or those derived from job descriptions or interviews. However, biochemical measures are typically only available for a sample of study subjects, for only a few pesticides, and at only specific times. Ideally, to allow epidemiological surveillance of a farming population using pesticides, it would be necessary to implement a system of registration that would identify the exposed subjects and specify and quantify exposure. This 156
egistry could be linked to the licence required in some countries to buy and use some classes of pesticides. An experiment on the feasibility of this approach over a large geographical area is currently under way in Lombardy, Italy. The ICPS intends to establish an epidemiological observatory through which people and pesticide usage will be registered and specific epidemiological investigations carried out on selected subgroups of the farming population. This project will include about 500 000 farmers and cover an area equal to one-eighth of the country ICOH (International Commission on Occupational Health). 1990. Proceedings of the 9th International workshop, 2-4 May 1990, International Centre for Pesticide Safety, Busto Garolfo, Milan, Italy. ICOH, Geneva, Switzerland. 157
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Impact of pesticide use on health i
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IMPACT OF PESTICIDE USE ON HEALTH I
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©International Development Researc
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Contents Acknowledgments viii Forew
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Control of disease vectors: a curre
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Foreword From their first appearanc
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PART! EPIDEMIOLOGY OF PESTICIDE POI
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Although pesticides are used both i
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Table 1. Introduction of pesticides
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problem. The International Developm
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impact of pesticides on Canadian wi
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investigated further. For example,
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Conclusions The subject of this vol
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Jusoh Mamat, M.; Anas, A.N.; Heong,
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Health-risk assessment of pesticide
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especially in the absence of comple
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depends largely on external factors
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Specific situations may require spe
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that the best possible work is done
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doses (chronic poisoning) or delaye
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Table 1. Poisoning incidents in fou
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Pesticide research for public healt
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Current pest control practices in T
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800- 400- 200 - 1980 1981 1982 1983
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designed 30-40 years ago (Jusoh Mam
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and tore easily. One investigation
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education, mass-communication tools
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Increase and improve training activ
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Castaneda, C.P. 1988. Pesticide poi
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Ooi, A.C.P.; Heong, K.L.; Lim, B.K.
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Investigations into acute pyrethroi
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Level of exposure To assess the lev
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Table 2. Cases of acute pyrethroid
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(in 121 subjects), usually develope
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Deltamethrin was detectable in the
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pyrethroid poisoning. Therefore, th
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Gilliatt, R.W.; Willison, R.G. 1963
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Table 1. Value of imported pesticid
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Study two Twelve farmers participat
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All activities Left hand (73.2) Lef
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Acknowledgment- The three studies r
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Since the creation of Pakistan in 1
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Table 1. Incidents of pesticide poi
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Sandu, S.S.; Waters, M.D.; Simmon,
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and chlordane. Pest resistance to t
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young workers was 15.8%, 6.8%, and
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Storage of pesticides Although the
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Discussion The lowland regions and
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Pulmonary obstructive disease in a
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To investigate the presence and mea
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Age (years) Table 1. Distribution o
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was among paraquat users who smoked
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Levin, P.J.; Klaff, L.J.; Rose, A.G
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the delta. The total population of
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The successive and simultaneous rel
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on clinical studies and laboratory
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This made the collection of blood s
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Table 1. Relation between informati
Page 117 and 118: analysis, and engaging in various t
Page 119 and 120: Table 1. Value (million KSH) of pes
Page 121 and 122: To develop a health-education packa
Page 123 and 124: Storage site Table 3. Storage of ag
Page 125 and 126: Table 5. Causes of agrochemical and
Page 127 and 128: Methods A pilot field survey was un
Page 129 and 130: Conclusion The practices followed b
Page 131 and 132: manufactured or formulated locally,
Page 133 and 134: However, based on individual compla
Page 135 and 136: Table 4. Acetylcholinesterase activ
Page 137 and 138: Age did not appear to be an importa
Page 139 and 140: eactions to the pesticides in occup
Page 141 and 142: Bowers, M,B.; Goodman, E.; Sim, V.M
Page 143 and 144: Extent of exposure of farm workers
Page 145 and 146: Group III consisted of 31 farmers w
Page 147 and 148: 25 - 0 Level of exposure J Group 1,
Page 149 and 150: Pesticides were stored everywhere c
Page 151 and 152: Table 2. Concluded. Question Answer
Page 153 and 154: PART II RELATING PESTICIDE DEVELOPM
Page 155 and 156: Toxicity Table 1. Requirements and
Page 157 and 158: Screening Process development Route
Page 159 and 160: Progress in improving safety Pestic
Page 161 and 162: type of formulation, and warning pr
Page 163 and 164: The pyrethroid, cypermethrin, is mo
Page 165 and 166: Studying the effects of pesticides
Page 167: of the risk is a quantitative issue
Page 171 and 172: poisoned through mishandling of an
Page 173 and 174: no documented incident could be fou
Page 175 and 176: Region Table 3. Use of using pictog
Page 177 and 178: of fluorinated HDPE because fluorin
Page 179 and 180: Current initiatives, at the interna
Page 181 and 182: inding within their jurisdictions.
Page 183 and 184: Benefits of a hazard auditor From t
Page 185 and 186: different agencies take to be permi
Page 187 and 188: industry and of its serving to legi
Page 189 and 190: Anonymous. 1988a. FAO code of condu
Page 191 and 192: (Adam 1976; Fraser and Burrill 1979
Page 193 and 194: in the lower price categories tend
Page 195 and 196: Anas, N.; Jusoh Mamat, Md.; Heong,
Page 197 and 198: Zam, A.K. 1980. Bancian pengurusan
Page 199 and 200: Materials and methods Assessment of
Page 201 and 202: At the end of each day's operations
Page 203 and 204: Table 3. Number of garments chafing
Page 205 and 206: underlines the need to change attit
Page 207 and 208: Evaluation and management of pestic
Page 209 and 210: target and react with some crucial
Page 211 and 212: scientists on a contractual basis,
Page 213 and 214: pesticides in developing countries
Page 215 and 216: Regional information resources for
Page 217 and 218: Table 2. Number of enquiries receiv
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extent of this problem in developin
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Promoting the safe use of pesticide
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pests) is observed. Thus, the "quic
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is one of principal agencies respon
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Pretesting materials in training an
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of costly medical technologies and
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The agricultural sector has by far
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At the community level, the extent
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Neufeld, V. 1989. Community-based m
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Outline for learning module using o
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WHO (World Health Organization). 19
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In the past decade, tremendous effo
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Jiang-Su province Results and discu
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As a result of deregulation, the nu
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Table 3. Proportion of workers usin
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Shih, J.H.; Wu, Z.Q.; Zhang, Y.X.;
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Pesticides and wildlife: a short gu
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Using target-specific products mini
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specifications. Other data are asse
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Formulation-specific concerns The e
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mirex, and chiordecone have been ba
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1984). The base for pesticide granu
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e more stringently reviewed. In Can
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For example, searching for carcasse
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overlooked. In developing countries
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Establish monitoring programs to de
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Grue, C.E.; Fleming, W.J.; Busby, D
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Schafer, E.W., Jr; Brunton, R.B. 19
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Table 1. Prevalence and distributio
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By 1980, resistance to at least one
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tries. Japanese encephalitis has be
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to the targeted larvae of mosquitoe
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The role of the community Many prob
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from locally available sacking mate
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services. The project also includes
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Maxwell, C.A.; Curtis, C.F.; Haji,
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Botanical pesticides: optimizing pe
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neurotoxin but a cytotoxin, cross-r
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MoDuscicide- and pesticide-developm
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A development plan has been identif
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and environmental effects must be d
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Devitt, B.D.; Philogène, B.J.R.; H
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Endod, a potential natural pesticid
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University in Ottawa, and in other
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in the field (Lugt 1981), 137 500 m
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Hutchinson, J.; Dalziel, J.M. 1929.
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Community participation, including
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Acknowledgment- This research has b
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multiplication. The high temperatur
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Because pesticides are required in
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Africa and now East Africa. The suc
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Integrated pest management 1PM may
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to risk crop damage. Close involvem
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Ramos-Ocampo, V.E.; Magallona, E.D.
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esidues on fresh and cooked vegetab
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Grassy strip 108 N Farmer's Experim
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Table 1. Description and efficiency
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Table 3. Cost (PHP) of pest managem
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in the field. These pests were the
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PART V APPENDICES
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Ravindra Fernando, National Poisons
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Frank White, Pan-American Health Or
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ECHO abdominal ultrasonograph EEG e
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URT upper respiratory tract USAID U
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