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Definition. Persistent infections are characterized as those in which the virus is not cleared but remains in specific cells of infected individuals. Persistent infections may involve stages of both silent and productive infection without rapidly killing or even producing excessive damage of the host cells.
Apr 16, 2014 · Typhoid fever ppt. Typhoid fever is caused by the bacterium Salmonella typhi. It remains a major public health problem, infecting over 21 million people annually and causing over 200,000 deaths per year globally. The disease is transmitted through contaminated food or water. Clinical features include a sustained high fever over several weeks ...
Sep 18, 2015 · Microbiology of dental caries Oday altaani 2. Definition: chronic endogenous infection caused by the normal oral commensal flora. the initial process of enamel demineralization is usually followed by remineralization Caries is defined as localized destruction of the tissues of the tooth by bacterial fermentation of dietary carbohydrates.
Description: a group of eukaryotic organisms that includes microorganisms such as yeasts, molds, and mushrooms. Nutrient absorbers, plant decomposers, does not contain chlorophyll. ~100 human pathogens. Types: yeasts (unicellular fungi), molds (filamentous fungi) Diseases: ringworm (pictured), athlete's foot, etc.
Dec 25, 2017 · Microorganism is the general term for all tiny microorganisms that are invisible or invisible to the naked eye. The structure is relatively simple, the individual is small (generally <0.1mm), and can be divided into prokaryotes, eukaryotes and non-cells according to their evolution level and traits The process of human understanding of microorganisms The hard-to-understand microbial world ...
Feb 24, 2015 · 4. Mode of transmission • The microorganism can be acquired by: – Contact transmission (direct & indirect), – Droplet transmission (inhalation through respiratory tract), – Airborne transmission, – ingestion (through gastrointestinal tract), – inoculation (through accidental sharp injury or bites), – transplacental transmission ...
Jan 1, 2020 · History of Microbiology. Spontaneous Generation • Spontaneous Generation is the Theory that life come from inanimate objects or non-living things. • The Theory of Spontaneous Generation was disproved and Microbiology was founded by some amazing scientists. Let’s briefly review some of these scientists. In 1668-Redi devised an experiment ...
