11 Facts About Infectious disease

An infectious disease, known as a transmissible disease or communicable disease, is an illness resulting from an infection.

Diagnosis of infectious disease sometimes involves identifying an infectious agent either directly or indirectly.

Conclusions about the cause of the Infectious disease are based upon the likelihood that a patient came in contact with a particular agent, the presence of a microbe in a community, and other epidemiological considerations.

Diagnosis of infectious disease is nearly always initiated by medical history and physical examination.

Some signs are specifically characteristic and indicative of a Infectious disease and are called pathognomonic signs; but these are rare.

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Chagas Infectious disease is the most significant example, because it is difficult to directly demonstrate the presence of the causative agent, Trypanosoma cruzi in a patient, which therefore makes it difficult to definitively make a diagnosis.

For example, in the early 1980s, prior to the appearance of AZT for the treatment of AIDS, the course of the Infectious disease was closely followed by monitoring the composition of patient blood samples, even though the outcome would not offer the patient any further treatment options.

The appearance and severity of Infectious disease resulting from any pathogen depend upon the ability of that pathogen to damage the host as well as the ability of the host to resist the pathogen.

One manner of proving that a given disease is infectious, is to satisfy Koch's postulates, which require that first, the infectious agent be identifiable only in patients who have the disease, and not in healthy controls, and second, that patients who contract the infectious agent develop the disease.

Epidemiology, or the study and analysis of who, why and where disease occurs, and what determines whether various populations have a disease, is another important tool used to understand infectious disease.

Infectious disease mentioned that people can transmit disease to others by breath, noted contagion with tuberculosis, and discussed the transmission of disease through water and dirt.