Table of Contents

 

 

 

 

Preface

xv

1

Symbiosis and Parasitism

1

 

Definitions

2

 

Commensalism

2

 

Phoresis

2

 

Parasitism

2

 

Mutualism

4

 

Ecological Aspects of Parasitism

5

 

Medical Implications

7

 

Control Impediments

8

 

Intermediate Hosts

8

 

Vectors

8

 

Resistance and Resurgence

9

 

Diagnosis

9

 

Factors influencing Prevalence

9

 

Unsanitary Living Conditions

10

 

Disease Control and Treatment

10

 

Poor Nutrition

10

 

Health Education

10

 

Regional and Ethnic Customs

10

 

Climatic Conditions

11

 

Opportunistic Parasitism

11

 

Evolution of Parasitism

11

 

Suggested Readings

13

2

Parasite-Host Interactions

15

 

Effects of Parasites on Hosts

16

 

Tissue Damage

16

 

Parenchymatous or Albuminous Degeneration

16

 

Fatty Degeneration

16

 

Necrosis

16

 

Tissue Changes

16

 

Hyperplasia

16

 

Hypertrophy

17

 

Metaplasia

17

 

Neoplasia

17

 

Biological Adaptations of Parasitism

17

 

Physiology and Biochemistry of Parasitism

17

 

Immunology

18

 

Toll-like Receptors

18

 

Class I Endogenous Pathway

22

 

Class II Exogenous Pathway

23

 

T Cell Activity

23

 

B Cell Activity

24

 

Genetics of Immunoglobulin Variability

27

 

Opportunistic Parasites

28

 

Toxoplasma gondii

30

 

Cryptosporidium parvum

31

 

Enterocytozoon bieneusi

31

 

Leishmania spp.

31

 

Trypanosoma cruzi

32

 

Plasmodium spp

32

 

Giardia Lamblia

32

 

Strongyloides stercoralis

32

 

Schistosoma spp

33

 

Resistance

33

 

Selected Readings

34

I

THE PROTOZOA

 

3

General Characteristics of the Euprotista (Protozoa)

37

 

Locomotor Organelles Flagella

38

 

Cilia

41

 

Pseudopodia

42

 

Other Organelles

43

 

Nucleus

43

 

Vesicular Nucleus

44

 

Compact Nucleus

44

 

Mitochondria

44

 

Golgi Complex

44

 

Lysosomes

45

 

Cytoplasmic Food Storage

46

 

Ribosomes

46

 

Costa, Axostyle, and Vacuoles

46

 

Encystation

47

 

Reproduction

48

 

Suggested Readings

49

 

Classification of the Protozoa

49

 

Kingdom Euprotista

49

 

Phylum Euglenista

49

 

Phylum Metamonada

49

 

Phylum Parabasala

50

 

Phylum Rhizopoda

50

 

Phylum Percolozoa

50

 

Phylum Apicomplexa

51

 

Phylum Ciliophora

51

4

Visceral Protozoa I: Rhizopods (Amoebae) and Ciliphorans

53

 

Amoebae

53

 

Entamoeba histolytica

55

 

Life Cycle

56

 

Epidemiology

58

 

Symptomatology and Diagnosis

60

 

Chemotherapy

61

 

Physiology

61

 

Host Immune Response

61

 

Prevention

62

 

Entamoeba dispar

61

 

Entamoeba hartmanni

62

 

Entamoeba coli

62

 

Entamoeba polecki

63

 

Entamoeba gingivalis

63

 

Lodamoeba bütschlii

64

 

Endolimax nana

64

 

Pathogenic Free-Living Amoebae

65

 

Naegleria fowleri

65

 

Acanthamoeba and Balamuthia

66

 

Microsporidians

67

 

Ciliates

68

 

Balantidium coli

68

 

Life Cycle

69

 

Epidemiology

70

 

Symptomatology and Diagnosis

70

 

Chemotherapy

70

 

Selected Readings

70

5

Visceral Protozoa II: Flagellates

73

 

Nontrichomonad Flagellates

73

 

Giardia lamblia

73

 

Life Cycle

74

 

Epidemiology

74

 

Symptomatology and Diagnosis

76

 

Chemotherapy

77

 

Physiology

77

 

Host Immune Response

77

 

Prevention

78

 

Chilomastix mesnili

78

 

Retortamonis inicstinalis

78

 

Entcromonas hominis

79

 

Dientamoeba fragilis

19

 

The Genus Trichomonas and Related Forms

80

 

Trichomonas tenax

81

 

Trichomonas vaginalis

81

 

Life Cycle

82

 

Epidemiology

82

 

Symptomatology and Diagnosis

82

 

Chemotherapy

83

 

Physiology

83

 

Pentatrichomonas (Trichomonas) hominis

83

 

Selected Readings

84

6

Blood and Tissue Protozoa 1: Hemoflagellates

85

 

Morphologic Forms

87

 

Amastigote

87

 

Promastgote

87

 

Epimastigote

87

 

Trypomastigote

89

 

Genus Leishmania

90

 

Life Cycle

90

 

Physiology

92

 

Host Immune Response

94

 

Visceral Leishmaniasis (Leishmania donovani)

94

 

Epidemiology

94

 

Symptomatology and Diagnosis

97

 

Chemotherapy

98

 

Cutaneous Leishmaniasis (Leishmania tropica and Leishmania mexicana)

98

 

Epidemiology

98

 

Symptomatology and Diagnosis

99

 

Chemotherapy

99

 

Mucocutaneous Leishmaniass (Leiskmania braziliensis)

100

 

Epidemiology

100

 

Symptomatology and Diagnosis

100

 

Chemotherapy

101

 

Genus Trypanusoma

101

 

African Trypanosomiasis (Trypanosoma brucei rhodesiense and Trypanosoma brucei gambiense)

102

 

Life Cycle

102

 

Epidemiology

104

 

Symptomatology and Diagnosis

105

 

Chemotherapy

106

 

Host Immune Response

106

 

Physiology

108

 

American Trypanosomiasis (Trypanosoma cruzi)

108

 

Life Cycle

108

 

Epidemiology

110

 

Symptomatology and Diagnosis

111

 

Chemotherapy

112

 

Physiology

112

 

Host Immune Response

112

 

Selected Readings

112

7

Blood and Tissue Protozoa II: Human Malaria

115

 

Plasmodium and Human Malaria

116

 

Life Cycle

117

 

Life Cycle Variations

123

 

Plasmodium Vivax and P. ovale (Benign Tertian Malaria)

123

 

Plasmodium malariae (Quartan Malaria)

124

 

Plasmodium falciparum (Malignant Tertian Malaria)

125

 

Epidemiology

125

 

Relapse and Recnidescence

129

 

Symptomatology and Diagnosis

130

 

Chemotherapy

132

 

Host Immune Response

134

 

Physiology

135

 

Selected Readings

136

8

Blood and Tissue Protozoa III: Other Protists

137

 

Babesia

137

 

Life Cycle

138

 

Symptomatology and Diagnosis

138

 

Chemotherapy

138

 

Toxoplasma gondii

139

 

Life Cycle

140

 

Epidemiology

143

 

Symptomatology and Diagnosis

143

 

Chemotherapy

144

 

Host Immune Response

144

 

Cryptosporidium parvum

145

 

Life Cycle

145

 

Epidemiology

145

 

Symptomatology and Diagnosis

148

 

Chemotherapy

148

 

Host Immune Response

148

 

Cylospora cayentanensis

148

 

Symptomatology and Diagnosis

149

 

Chemotherapy

149

 

Isospora belli

149

 

Blastocystis hominis

149

 

Selected Readings

150

II

THE TREMATODA

 

9

General Characteristics of the Trematoda

153

 

Structure of Adult

155

 

Tegument

155

 

Digestive Tract

156

 

Muscular and Nervous Systems

159

 

Osmoregulatory System

160

 

Reproductive Systems

161

 

Male System

162

 

Sperm

163

 

Female System

164

 

The Egg

166

 

Generalized Life Cycle Patterns

167

 

The Miracidium

168

 

The Sporocyst

171

 

The Redia

173

 

The Cercaria

173

 

The Metacercaria

175

 

Germ Celt Cycle

175

 

Physiology

176

 

Chemotherapy

176

 

Selected Readings

177

 

Classification of the Trematoda

177

 

Phylum Platyhelminthes

177

 

Class Trematoda

177

 

Order Strigeata

177

 

Order Echinoformata

178

 

Order Opisthorchiate

178

 

Order Plagiorchiata

178

10

Visceral Flukes

179

 

Liver Flukes

180

 

Fasciola hepatica

180

 

Life Cycle

181

 

Epidemiology

182

 

Symptomatology and Diagnosis

182

 

Chemotherapy

182

 

Host Immune Responses

182

 

Clonorchis Sinensis

183

 

Life Cycle

183

 

Epidemiology

184

 

Symptomatology and Diagnosis

185

 

Chemotherapy

186

 

Opisthorchis felineus and O. viverrini

186

 

Intestinal Flukes

187

 

Fasciolopsis buski

187

 

Life Cycle

187

 

Epidemiology

187

 

Symptomatology and Diagnosis

187

 

Echinostoma trivolvis

188

 

Life Cycle

189

 

Epidemiology

190

 

Symptomatology and Diagnosis

190

 

Heterophyes heterophyes and Metagonimus yokagawai

190

 

Life Cycle

190

 

Epidemiology

191

 

Symptomatology and Diagnosis

192

 

Lung Flukes

192

 

Paragonimus westermani

192

 

Life Cycle

193

 

Epidemiology

194

 

Symptomatology and Diagnosis

195

 

Human Immune Response

195

 

Selected Readings

195

11

Blood Flukes

197

 

Morphology

199

 

Life Cycle

199

 

Variations

205

 

Schistosoma haematobium

205

 

Schistosoma mansoni

205

 

Schistosoma japonicum

207

 

Symptomatology and Diagnosis

208

 

Chemotherapy

209

 

Host Immune Response

209

 

Other Schistosomes

211

 

Swimmer’s Itch

211

 

Selected Readings

212

III

THE CESTODA

 

12

General Characteristics of the Cestoda

217

 

Morphology

218

 

Tegument

218

 

Parenchyma

220

 

Parenchymal Muscles

221

 

Scolex

222

 

Calcareous Corpuscles

223

 

Osmoregulatory System

224

 

Nervous System

226

 

Reproductive Systems

226

 

Male System

227

 

Female System

227

 

The Egg

229

 

Life Cycle Patterns

231

 

Pseudophyllidean Pattern

231

 

Cyclophyllidean Pattern

232

 

Physiology

232

 

Chemotherapy

233

 

Host Immune Response

233

 

Selected Readings

234

 

Classification of the Cestoda

235

 

Class Cercomeiomorphae

235

 

Subclass Cestoda

235

 

Order Cyclophyllidea

235

 

Order Pseudophyllidea

235

13

Intestinal Tapeworms

237

 

Diphyllobothrium latum

237

 

Life Cycle

238

 

Epidemiology

240

 

Symptomatology and Diagnosis

240

 

Taenia solium

241

 

Life Cycle

242

 

Epidemiology

242

 

Symptomatology and Diagnosis

243

 

Taenia saginata

244

 

Life Cycle

244

 

Epidemiology

244

 

Symptomatology and Diagnosis

244

 

Hymenolepis nana

245

 

Life Cycle

245

 

Epidemiology

247

 

Symptomatology and Diagnosis

247

 

Hymenolepis diminuta

247

 

Dipylidium caninum

248

 

Life Cycle

249

 

Epidemiology

249

 

Symptomatology and Diagnosis

249

 

Selected Readings

249

14

Extraintestinal Tapeworms

251

 

Human Sparganosis

252

 

Life Cycle

252

 

Epidemiology

252

 

Symptomatology and Diagnosis

253

 

Chemotherapy and Treatment

253

 

Prevention

253

 

Host Immune Response

254

 

Human Cysticercosis

254

 

Life Cycle

254

 

Epidemiology

254

 

Symptomatology and Diagnosis

255

 

Chemotherapy and Treatment

256

 

Host Immune Response

256

 

Prevention

257

 

Human Hydatidosis

257

 

Life Cycle

257

 

Epidemiology

261

 

Symptomatology and Diagnosis

262

 

Chemotherapy and Treatment

264

 

Host Immune Response

264

 

Prevention

264

 

Selected Readings

264

IV

THE NEMATODA

 

15

General Characteristics of the Nematoda

269

 

Structure of the Adult

270

 

Cuticle

270

 

Hypodermis

272

 

Musculature

273

 

Digestive Tract

275

 

Foregut

275

 

Midgut

276

 

Hindgut

276

 

Nervous System

277

 

Excretory System

278

 

Reproductive Systems

279

 

Male System

279

 

Female System

280

 

Molting

281

 

Larval Forms

283

 

Rhabditiform Larva

283

 

Filariform Larva

283

 

Microfilaria

283

 

Physiology

285

 

Selected Readings

285

 

Classification of the Nematoda

285

 

Phylum Nematoda

285

 

Class Adenophorea

286

 

Class Secernentea

286

16

Intestinal Nematodes

291

 

The Adenophorea

292

 

Trickuris trichiura

292

 

Life Cycle

292

 

Epidemiology

295

 

Symptomatology and Diagnosis

295

 

Chemotherapy

295

 

Host Immune Response

295

 

Trichinella spiralis

296

 

Life Cycle

297

 

Epidemiology

299

 

Symptomatology and Diagnosis

300

 

Chemotherapy

300

 

Host Immune Response

301

 

Prevention

301

 

The Secernentea

301

 

Strongyloides scercoralis

301

 

Life Cycle

302

 

Epidemiology

304

 

Symptomatology and Diagnosis

304

 

Chemotherapy

306

 

Host Immune Response

306

 

Prevention

306

 

Human Hookworm Disease

306

 

Necator americanus and Ancylostoma duodenale

307

 

Life Cycle

307

 

Epidemiology

310

 

Symptomatology and Diagnosis

311

 

Chemotherapy

312

 

Host Immune Response

312

 

Prevention

313

 

Cutaneous Larval Migrans

313

 

Epidemiology

313

 

Symptomatology and Diagnosis

313

 

Chemotherapy

313

 

Prevention

314

 

Ascaris lumbricoides

314

 

Life Cycle

316

 

Epidemiology

316

 

Symptomatology and Diagnosis

318

 

Chemotherapy

318

 

Host Immune Response

318

 

Prevention

318

 

Visceral Larval Migrans

319

 

Epidemiology

319

 

Symptomatology and Diagnosis

320

 

Chemotherapy

320

 

Prevention

320

 

Anasakis spp.

320

 

Enterobius vermiadaris

321

 

Life Cycle

321

 

Epidemiology

323

 

Symptomatology and Diagnosis

325

 

Chemotherapy

326

 

Prevention

326

 

Selected Readings

326

17

Blood and Tissue Nematodes

329

 

Life Cycle

330

 

Periodicity

331

 

Filarial Worms

331

 

Wuckereria bancrofti

331

 

Life Cycle

333

 

Epidemiology

333

 

Symptomatology and Diagnosis

334

 

Chemotherapy

334

 

Host Immune Response

335

 

Prevention

335

 

Brugla malayi

335

 

Life Cycle

335

 

Epidemiology

336

 

Symptomatology and Diagnosis

336

 

Chemotherapy and Prevention

336

 

Human Immune Response

336

 

Onchocerca volvulus

336

 

Life Cycle

336

 

Epidemiology

337

 

Symptomatology and Diagnosis

337

 

Chemotherapy

338

 

Host Immune Response

338

 

Prevention

338

 

Loa loa

339

 

Life Cycle

339

 

Epidemiology

339

 

Symptomatology and Diagnosis

339

 

Chemotherapy

340

 

Prevention

340

 

Mansonella ozzardi, Mansonella perstans, and Mansonella streptocerca

340

 

The Guinea Worm

341

 

Draunculus medinensis

341

 

Life Cycle

341

 

Epidemiology

342

 

Symptomatology and Diagnosis

343

 

Chemotherapy

343

 

Prevention

344

 

Selected Readings

344

V

ARTHROPODA

 

18

Arthropods as Vectors

349

 

Significance of Arthropods as Vectors

350

 

General Structural Features

352

 

The Dipterans

356

 

Biting Dipterans

357

 

Mosquitoes

357

 

Blackflies

360

 

Sandflies

360

 

Tsetse Flies

361

 

Tabanid Flies

362

 

Nonbiting Dipterans

363

 

Other Insects

365

 

Reduviid Bugs

365

 

Fleas

366

 

Lice

370

 

The Acarines

372

 

Ticks

372

 

Mites

375

 

Selected Readings

376

 

Classification of the Arthropoda

376

 

Phylum Arthropoda

376

 

Subphylum Uniramia

376

 

Class Insecta

376

 

Subphylum Chelicerata

378

 

Glossary

381

Appendix A

Drugs for Parasitic Infections: Partial List of Generic and Brand Names

397

Appendix B

Current Chemotherapeutic Regimens

399

Appendix C

Adverse Effects of Antiparasitic Drugs

409

 

Index

413