BIOLOGY: What is the difference b/w infective stage and pathogenic stage of a parasite ?

Question

There r 2 stages in the life cycle of a parasite- infective stage and pathogenic stage... do u know the difference ??

eg. For eg.in " Entamoeba histolytica " the infective stage is " quadrinucleate stage" and pathogenic stage is "magnaform "

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Answer 1

Pathogen or pathogenic is micro organism which can cause or produce a disease.Pathology report is done to find out the cause of disease.

Infective disease is caused by a microbe which can be caught from another personbut whih can not always be directly transmitted.

Answer 2

The infective stage of a parasite is the stage in which the developing parasite is capable of entering the body of the host. the pathogenic stages comes after entry of the body and it is when the parasite causes remarkable ditruction of host cells.

Answer 3

In order to answer this question you have to divide parasites into endoparasites (ones that live in you), and exoparasites (ones that live ON you).  

An endoparasite is usually immediately 'pathenogenic' because it immediately causes a reaction of some sort.  Body lice are sort of intermediate... they live ON you, but under the skin, and then become pathenogenic by spreading infection when you claw them.

An endoparasite lives IN you, and so you notice them when you get sick.  Sometimes the bulk of their pathenogenic result is directly from feeding on you, or on the food that you eat, until you become weak and/or anemic, this is especially true of tapeworms.  Others make you ill because they secrete things that alter your digestion or your immune system, a few because they release young into your blood, or breed in your blood and get filtered out throughout your body, like Chagas Disease, or elephanitis.

A few parasites have co-evolved with human beings to the point where some human beings do not modulate their bodies well without those parasites, for instance round worm seems to prevent  and treat Crohn's disease, an autoimmune problem that causes a lot of suffering.

Infective stage is usually an immature paratsite, or even just the eggs of a parasite, and in this stage you will unknowingly eat them, or not notice when they bore into your skin, or otherwise sneak into you.  Most people are just too smart to eat an endoparasite.  

"Quadranucleate" refers to something microscopic, so small it has only 4 nuclei... Magnaform means literally 'great big one' or all grown up.  Clearly it is easier to get someone to eat something too small to see that is bad for them than to get them to eat something MAGNAform :)  That is their secret plan, to get you to eat them.

Pathenogenic means that they are now causing you trouble.

The pathenogenic stage is when they have reached maturity, sometimes in a very different form than their immature stage.  They are prepared to seriously feed on you, and secrete stuff that protects themselves while sometimes causing you troubles.  

Their fertile cycle is sometimes their pathenogenic cycle, because in order to spread they need to make you cough up their immature forms or eggs, or spread them by diarrheal products, or even bore out of your skin as larval forms.  Horribly some of them cause troubles with masses of young in really delicate places, like your eyeballs.

People cough up roundworms and re-swallow them to continue their lifecycle, people get diarrhea from some intestinal parasites, and people scratch their butts and then put pinworm larva back in their mouths with their food.  In some extreme cases people die, rot and release parasites, that is why handling the dead should be a careful thing, or handling of carcasses.

Answer 4

Simply remember infective stage is entry level of pathogen in hosts body (it many be a different stage and less number)

whereas pathogenic stage is the stage attained by a pathogen that it can create a phogencity in body (or showing syptoms) that occurs when pathogen is stablished in body, it is normally after incubation period of the pathogen in the host body: kindly follow the basic rules of biology which are very easy once you have understood