Introduction To Medical Parasitology Flashcards
Dependence of one living organism on another?
Parasitology
Study of animal parasites of humans and their medical significance?
Medical Parasitology
an organism that lives on or within another organism -derives the benefits -may or may not offer consequences ?
Parasite
organism in/on which a parasite lives of?
Host
unlike organisms live together, both partners have advantages
Symbiosis
One benefits without harming or benefiting the other
Commensalism
two organisms benefit from each other
Mutualism
parasite lives in another, depending on the host for survival
Parasitism
living inside the body of the host
Endoparasite
Living outside the body of the host
Ectoparasite
presence of an endoparasite
Infection
presence of an ectoparasite
Infestation
parasites that cause DIRECT HARM to their host
Pathogenic parasites
parasites that DO NOT DIRECTLY CAUSE HARM to their host
Commensals
definitely NEED to live off host/s to survive (eg. Ascaris, trichuris)
Obligate Parasites
may live off of host/s or may exist in free-living form in the environment
Facultative Parasite
which the parasite attains sexual maturity; host wherein the parasite lives off its adult and sexual stages
Definitive/Final host
here they undergo asexual or larval stage; common with flukes **not all parasites have intermediate hosts, no definitive host = not a parasite
Intermediate host
parasite does not develop further; it remains alive and is able to infect another host
Paratenic host
host wherein the parasite continues any of its stages and acts as additional sources of human infection; common with flatworms
Reservoir host
any organism responsible for transmitting parasite infection from one host to another
Biologic vector
nonliving things which transmit infection
Fomite
stage in the life cycle that enables parasite to infect man Ie. Ascarisembryonated egg
Infective Stage
stage in the life cycle that man usually identifies to confirm the presence of a parasite infection
Diagnostic Stage
branch of medicine which deals with tropical diseases and other medical problems of a tropical region?
Tropical Medicine
illness which is endemic in tropical areas and sporadic in areas not tropical?
Tropical Dieseases
parasites found in an organ which is not its usual habitat?
Erratic
establishes itself in a host where it does not ordinarily live.
inccidental or accidental parasite
remains on or in the body of the host for its entire life
Permanent parasite
lives on the host only for a short period of time
Temporary Parasite
free living organism that passes through the digestive tract without infecting the host
Spurious Parasite
harmful and cause mechanical injury to the host
Pathogens
harbours the pathogen without manifesting signs and symptoms
Carrier
inoculating an infective agent
Exposure
connotes the establishment of the infective agent in the host
Infection
period between infection and evidence of symptoms
Incubation/Clinical Incubation Period
period between infection and evidence of infection
Pre-patent/Biologic Incubation Period -
infected individual becomes his own direct source of infection
Autoinfection
already infected individual is further infected with same species, leading to massive infection
Superinfection
Sources of Infection:
Contaminated water and soil Lack of sanitary toilets Use of excreta as fertiliser (night soil) Consumption of undercooked food Arthropods and mosquitoes Another person, beddings, environment, self cats rats
Mode of entry
- Ingestion a. Fecal -> oral b. Nonfecal contamination – capillaria 2. Skin penetration a. Direct –- hookworms b. Vector-borne – malaria 3. Respiratory a. Inhalational b. Direct penetration – naegleria 4. Blood transfusion/organ transplantation – malaria 5. Autoinfection a. Internal –- strongyloides b. External –enterobius (pinworm) congenital transmamary
Autoinfection
one parasite only (cause of another infection)
multiple infection
more than one parasite that cause the infection, thats why its MULTIPLE
study of patterns, distribution and occurrence of disease
Epidemiology
number of new cases appearing in a population in a given period of time
Incidence
number of individuals infected with a particular parasite
Prevalence
percentage of individuals infected by one parasite
Cumulative prevalence
number of worms per infected person
Intensity of infection
use of antihelminthic drugs
Deworming
percentage of previously positive subjects found to be egg negative on examination
Cure rate
percentage fall in egg counts after deworming
Egg reduction rate
ndividual-level deworming
Selective treatment –
group-level deworming
Targeted treatment –
population-level deworming
Universal treatment
proportion of the target population reached by an intervention
Coverage
transmitted loss of susceptibility to drug that was previously sensitive
Drug Resistance –
effect of a drug against an infective agent
Efficacy
measure of the effect of a drug
Effectiveness –
avoidance of illness
Morbidity control
aims to encourage people to adapt and maintain healthy life practices
Information-education-communication
planning, organization, performance and monitoring of activities for the modification of environmental factors
Environmental management
interventions to reduce environmental health risks
Environmental sanitation
provision of access to adequate facilities for the safe disposal of human excreta
Sanitation
permanent reduction to zero of the worldwide incidence of infection; continue measures no longer needed
Eradication
reduction to zero if incidence of a specified disease; needs continued intervention and surveillance measures
Elimination