Diseases, Conditions, Syndromes

U.S. doctor released from Omaha hospital after Ebola monitoring

(HealthDay)—An American doctor who was monitored for 21 days after possible Ebola exposure did not develop the deadly disease and has been released from the Nebraska Medicine-Nebraska Medical Center in Omaha, officials ...

Diseases, Conditions, Syndromes

Communicating effectively in crises

To combat epidemics, the local population must be more involved and respected, says Ursula Jasper. This is one of the lessons learned from the Ebola outbreak in West Africa in 2014.

Diseases, Conditions, Syndromes

Assessing the performance of multiple influenza forecasting models

In what the authors believe is the first documented comparison of several real-time infectious disease forecasting models by different teams across many seasons, five research groups report this week that a majority of models ...

Diseases, Conditions, Syndromes

New blood tests for TB could accelerate diagnosis

Rapid blood tests used by the NHS are unable to rule out tuberculosis (TB) and should be replaced with a new, more accurate test, a study has found.

Cardiology

Taking medicine for a cold? Be mindful of your heart

Flu has so far infected more than 6 million Americans this season, and winter colds are making their rounds. If you've been hit by either, you may be thinking about heading to your local pharmacy to relieve your aches, pains ...

Diseases, Conditions, Syndromes

How to train the body's own cells to combat antibiotic resistance

Drug-resistant superbugs have threatened human health for decades. The situation is getting worse because of the shortage of new antibiotics. But what if we changed the way we aim to treat them, and trained our cells to kill ...

Diseases, Conditions, Syndromes

Cellular protein a target for Zika control

A cellular protein that interacts with invading viruses appears to help enable the infection process of the Zika virus, according to an international team of researchers who suggest this protein could be a key target in developing ...

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Infectious diseases, also known as contagious diseases or transmissible diseases, and include communicable diseases, comprise clinically evident illness (i.e., characteristic medical signs and/or symptoms of disease) resulting from the infection, presence and growth of pathogenic biological agents in an individual host organism. In certain cases, infectious diseases may be asymptomatic for much or all of their course. Infectious pathogens include some viruses, bacteria, fungi, protozoa, multicellular parasites, and aberrant proteins known as prions. These pathogens are the cause of disease epidemics, in the sense that without the pathogen, no infectious epidemic occurs.

Transmission of pathogen can occur in various ways including physical contact, contaminated food, body fluids, objects, airborne inhalation, or through vector organisms. Infectious diseases that are especially infective are sometimes called contagious and can be easily transmitted by contact with an ill person or their secretions. Infectious diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are usually regarded as contagious but do not require medical quarantine of victims.

The term infectivity describes the ability of an organism to enter, survive and multiply in the host, while the infectiousness of a disease indicates the comparative ease with which the disease is transmitted to other hosts. An infection is not synonymous with an infectious disease, as some infections do not cause illness in a host.

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