Difference between Disease and Infection|10 points

Falling illness means an alteration in physiology from the normal well being of an individual or animal.

This illness can be due to a disease or a disorder.

The word “Disease” come from the words Des+ease =lack of ease or inconvenience.

Disease can be due to is a disturbance in health condition either infection of abnormal physiology.

The infection is one which is caused by a foreign agent leading physiological alteration.

While those of internal origin (non-infectious) can be due to some disorder of organ.

The infection is caused by microbes like bacteria, protozoa, fungi, yeast and virus.

The non-infectious disease is caused by derailment of physiology in some organ or even the whole body.

An infection can cause a disease but not all diseases are infections.

Difference between Disease and Infection

Sl. No Infection Non infectious Disease (normal disease)
1 Infection is caused by a microbe or external agent. Disease is caused by a change in the body physiology or biochemistry.
2. Diagnosis shows an external or foreign agents in the sample Diagnosis shows no foreign agents but increased or decreased levels of any of the body biological substance like enzyme, hormones, ions, glucose etc.
3 There is organ damage as long as the infectious agent stays in the body There might not be organ damage if simple head ache or vomiting. But if it is chronic type there is organ damage like in diabetes and cancer.
3. An infection can be prevented by vaccination beforehand. No vaccination can work. But proper health care, lack of stress and physical exercises can prevent from disease.
4. An infection is contagious, i.e. it spreads from one individual to another by means of some medium like water, air or by a vector i.e. mosquito, rats etc.Also it spread from one region to other in the same body. Does not spread from one person to another. But can spread within the person.
5. Infectious disease is curable by eradication of the infectious agents. But the damage might remain. Curable if simple and treatable if chronic type. Treatment goes on till life ends.
6. The sickness lasts for a short span Can be short span and of chronic based on the type. It can even last for years.
7. Drugs are aimed to kill the infectious agents. They are called chemotherapeutic agents or antibiotics if used against bacteria. Drugs aim to minimize the symptoms. Change in body biochemical alterations. Or replenish the lacking substance. Ex. Insulin is given to replenish the lack of production in body.
8. Relatively inexpensive. The medication in most case is for short duration like not more than a month. Except for TB and teniasis which last for few months. Inexpensive if simple type. But can be Expensive and sometimes very expensive based on the condition. Also the medication will be given on daily basis for many years or decades.
9 Symptoms will be debilitating due to infection. They will be clearly visible with few hours or day of infection. The symptoms will not be recognizable in first weeks or months. Less debilitating in initial stages
10 Chances of relapse are present. I.e. the infection eliminated can return back. Hence we see secondary treatment for TB, malaria etc. If relapsed the disease can be resistant to drugs. No chances of relapse if well cured.
11 Chances of drug resistance by the microbe. Chances of insensitivity to drugs. Dose might be increased.
11. Examples for infectious diseases cholera, TB, plague, AIDS. Head ache, pains, diabetes, heart attack etc.

Infection is always created by an external agent which are microbes. But those infection with macro organism are called infestations. These infestation include thread worm, ascaris, tenia solium etc. These are the ones which enter the body by contaminated food or by mosquito etc. Once they enter the body grow big to few centimeters and even meters long. They keep surviving by consuming the nutrition from the body of host. So they are called parasites.

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