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In certain cases, infectious diseases may be asymptomatic for much or even all of their course in a given host. In the latter case, the disease may only be defined as a "disease" (which by definition means an illness) in hosts who secondarily become ill after contact with an asymptomatic carrier. An infection is not synonymous with an ...
A pathogen may also be referred to as an infectious agent, or simply a germ. [1] The term pathogen came into use in the 1880s. [2] [3] Typically, the term pathogen is used to describe an infectious microorganism or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus.
In some countries, up to 80% of tuberculosis patients are also HIV-positive. [8] The potential for dynamics of these two infectious diseases to be linked has been known for decades. [ 9 ] Other common examples of coinfections are AIDS , which involves coinfection of end-stage HIV with opportunistic parasites [ 10 ] and polymicrobial infections ...
The good news is that TB death rates on a global basis are falling; however, there were still 8.6 million new cases of TB reported last year, and roughly one-third of the world's population ...
"It may surprise many people to know that now, over four years after the onset of the COVID pandemic, it is impossible to state precisely how long people remain infectious (and will test positive ...
A negative means you aren’t able to, and positive means you are able to. They can’t tell you for certain whether or not you have, or had, COVID, according to Adalja.
In the modern-day, the term has sometimes been broadened to encompass any communicable or infectious disease. Often the word can only be understood in context, where it is used to emphasize very infectious, easily transmitted, or especially severe communicable diseases. In 1849, John Snow first proposed that cholera was a contagious disease.
Asymptomatic carriers play a critical role in the transmission of common infectious diseases such as typhoid, HIV, C. difficile, influenzas, cholera, tuberculosis, and COVID-19, [2] although the latter is often associated with "robust T-cell immunity" in more than a quarter of patients studied. [3]