PARASITOLOGY: INTRODUCTION TO MEDICAL PARASITOLOGY

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PARASITOLOGY: INTRODUCTION TO PARASITOLOGY Definition of Parasitism

A symbiotic relationship where the parasite depends on the host for survival at the host's expense.

Possible Outcomes:

Parasite fails to establish

Host eliminates the infection

Host damaged by its own overactive immune response Host death

Parasitology: Study of organisms that depend on other living organisms. Medical Parasitology: Focuses on human parasites and their medical significance.

Tropical Medicine: Branch dealing with diseases endemic in tropical regions (mostly parasitic).

A. Anatomic Physiology of Parasitic Infection

A one. Host-Parasite Relationship (Adaptation)

Specialized Mechanisms:

A two. Effects of the Parasite on the Host

A three. Effects of the Host on the Parasite

B. Immunology of Parasitic Infections

B one. Host-Parasite Interactions (Natural Barriers)

B two. Protection of Parasites

B three. Protection of the Host

B four. Second Host Defense

B five. Host Immune Response

B six. Parasite Evasion Mechanisms

B seven. Adverse Effects of Immune Response (Hypersensitivity)

C. Signs and Symptoms

D. Treatment

E. Vaccination

PARASITOLOGY: INTRODUCTION TO MEDICAL PARASITOLOGY One. BIOLOGICAL RELATIONSHIPS

Two. CLASSIFICATION OF PARASITES

IMMUNOLOGY OF PARASITIC INFECTIONS

Two. Possible Outcomes of Host-Parasite Interaction

Three. HOST-PARASITE INTERACTIONS (First Line Defense)

Examples and Evasion by Parasites

Chemical Barriers

Body Fluids

Physiologic Functions

Three point two. SECOND HOST DEFENSE

Four. HOST IMMUNE RESPONSE A. Innate Immune Response

B. Acquired Immune Response

Five. ACQUIRED IMMUNE RESPONSE MECHANISMS

Five point two. Cell-Mediated Immunity Examples:

Five point three. Humoral Immunity (Antibodies):

Five point four. Other Antibody Actions:

A one. Classification by Phasmids:

B one. General Characteristics:

B two. Comparison of Medically Important Orders:

B three. Modes of Infection:

C. TREMATODES (Flukes)

C two. Classification by Habitat:

Genera

C three. Egg Development:

D one. General Characteristics:

Examples

D2. Effects on Human Health:

Five. Life Cycle

Diagnosis

Epidemiology

Animal Hookworms (Humans - Cutaneous Larva Migrans):

One. General Overview

Two. Parasite Biology

Three. Larval Stages

Five point one. Free-Living Cycle (Soil)

Five point two. Parasitic Cycle (Human)

Five point three. Autoinfection

Six. Pathogenesis and Clinical Manifestations Three Phases of Acute Infection

Symptoms

Seven. Severity of Infection

Nine. Complications

Egg Survival:

Site

Complications (Aberrant Migration)

Epidemiology

Prevention and Control

Personal Hygiene

Mass Drug

Capillaria philippinensis (intestinal capillariasis)

One. Parasite Biology

Adult Morphology

Both Sexes

Epidemiology (Global)

Trichinella spiralis Overview

Two. Adult Morphology

Three. Larva

Five. Hosts (Final and Intermediate)

Seven. Clinical Manifestations

One. Intestinal Phase (Adults)

Eight. Diagnosis

Ten. Prevention and Control

GROUP

ANISAKIS SPP.

Three. Clinical Manifestation

Four. Diagnosis

Five. Treatment

Dracunculus medinensis

Mode of Transmission

Intermediate Host

Morphology

Treatment

Prevention and Control

Common name

Cyclops, Copepods, Watercress

Worm Removal

Drink only clean water

Toxocara canis - Dog Ascarid Toxocara cati - Cat Ascarid

CUTANEOUS LARVA

A. braziliense

Smallest hookworm Common on cats and less frequent on dogs

FILARIAL NEMATODES

Clinical Manifestations

TREMATODE

One. GENERAL FEATURES

Two. CERCARIAL SERIES

Three. DIAGNOSTIC STAGE

Four. HABITAT

One. Schistosoma mansoni - Manson's blood fluke

Two. Schistosoma japonicum - Oriental blood fluke or East

Three. Schistosoma haematobium - Versicle bladder fluke

Egg Morphology

DEVELOPMENTAL STAGES - disappears when penetration is complete. First stage (mother) sporocyst.

Schistosomulum. After skin penetration.

DIAGNOSIS.

IMMUNODIAGNOSIS FOR SCHISTOSOMA SPECIES (TREMATODES).

Laboratory Diagnosis.

EPIDEMIOLOGY.

Intermediate Host.

Second Intermediate Host.

Paragonimus westermani.

EGG MORPHOLOGY.

ADULT.

Adult Worm Morphology (Paragonimus westermani).

CLINICAL SYMPTOMS Disease Names:

Pathophysiology:

Neurologic Condition (Cerebral Paragonimiasis):

Other Manifestations:

Fasciolopsis buski.

Infective Stage: Metacercaria (to definitive host).

Adult Characteristics of Fasciolopsis buski.

TREATMENT.

Echinostoma ilocanum.

Heterophyes heterphyes.

Egg Morphology (Heterophyes heterphyes).

Adult Worm Morphology (Heterophyes heterphyes).

Fasciola hepatica.

Symptoms include:

DIAGNOSIS Fascioliasis

TREATMENT: DIAGNOSIS Fascioliasis

TREATMENT: Praziquantel, bithionol, triclabendazole EPIDEMIOLOGY Fascioliasis

Loa Loa

Mansonella

SPECIMEN COLLECTION

C. TECHNIQUES

C2. Kato Thick Smear

C3. Concentration Techniques

Sedimentation Methods:

C4. Stool Culture Methods

Method

Copro Culture

Purpose: Assess intensity of infection (worm burden) and drug efficacy.

Kato-Katz

Stoll Egg Count

C6. Staining of Stool Specimen

D. PERIANAL SWAB

E-F. EXAMINATION OF BLOOD

F1. Finger-Prick Method

Thick Film

Thin Film

Stains:

Features

Capillary Tube Methods:

F2. Venous Blood Concentration

Knott's Concentration

Membrane Filtration

G-H. EXAMINATION OF SPUTUM

H1. Macroscopic Exam

H2. Microscopic Exam

J. EXAMINATION OF TISSUE ASPIRATES

K. EXAMINATION OF CEREBROSPINAL FLUID, CSF Parasites Found:

L. EXAMINATION OF TISSUE BIOPSY MATERIAL L1. Muscle Biopsy

· L2. Rectal Biopsy

Overview

This comprehensive text explores the definition and implications of parasitism, detailing various types of parasites and their effects on human health. It addresses host-parasite interactions, immune responses, and treatment strategies for parasitic infections.

Key Points

1Parasitism involves a relationship where one organism benefits at the expense of another
2Host immune responses can either eliminate parasites or cause damage to the host
3Effective treatments include antiparasitic medications and dietary changes
4The classification of parasites helps in understanding their life cycles and pathogenicity
5Understanding host-parasite interactions is crucial for developing prevention and treatment strategies.

Details

Category: Health and Medicine

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