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  2. Infection - Wikipedia

    en.wikipedia.org/wiki/Infection

    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 ...

  3. Pathogen - Wikipedia

    en.wikipedia.org/wiki/Pathogen

    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.

  4. Coinfection - Wikipedia

    en.wikipedia.org/wiki/Coinfection

    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 ...

  5. The 5 Most Common Infectious Diseases - AOL

    www.aol.com/news/2013-12-29-the-5-most-common...

    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 ...

  6. This Is How Long You’ll Probably Test Positive for ... - AOL

    www.aol.com/long-ll-probably-test-positive...

    "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 ...

  7. Why you have COVID symptoms and a negative test: You ... - AOL

    www.aol.com/finance/why-covid-symptoms-negative...

    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.

  8. Contagious disease - Wikipedia

    en.wikipedia.org/wiki/Contagious_disease

    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.

  9. Asymptomatic carrier - Wikipedia

    en.wikipedia.org/wiki/Asymptomatic_carrier

    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]