Create your own flashcards or choose from millions created by other students. B. Aerobic, Gram-positive bacteria in the genera Staphylococcus and Micrococcus. The top part of the skin, which is exposed to the environment, is called: Which bacterial genus is commonly associated with acne? All the following describe ways that pathogens penetrate the skin except for which one? B. chlorhexidine, azoles, and polyhexmamethylene biguanide*. Despite the inhospitable nature and defensive structures and chemicals of the skin, pathogenic microbes can still. D. Under the microscope, Staphylococcus bacteria form clusters and Streptococcus bacteria do not.*. https://quizlet.com/248699116/micro-chapter-21-questionsanswers-flash-cards 20. When the nasolacrimal duct becomes blocked, the lacrimal sac may become inflamed in a condition called ________. Sebum-rich areas of the skin, such as the back, generally harbor which of the following? Learn normal microbiota with free interactive flashcards. One reason that the skin is inhospitable to microbes is that: D. The normal microbiota outcompetes other microbes and inhibits their growth.*. A deep lesion that develops from multiple boils is called a: Systemic symptoms are most likely to develop with a: Which of the following describes impetigo? Of the patients below, which would most likely be an appropriate candidate for preventive or long-term treatment for candidiasis? Individuals infected with the loa loa parasite may develop ________, which are areas of allergic inflammation. Intertrigo and oral thrush can be caused by ________. ________ conjunctivitis is caused by bacteria. What causes the dark coloration? The phrase “normal microbiota ” refers to the microorganisms that reside on the surface and deep layers of skin, in the saliva and oral mucosa, in the conjunctiva, and in the gastrointestinal tracts of every human being. E) respond quickly to treatment with a single dose of topical antifungal medication. Biofilms make the treatment of skin infections more difficult. D. It varies depending on microenvironment and is an important part of the nonspecific immune system.*. Host interactions with skin microbiota It is still too early to say with confidence what the exact assembly of the complex network of human microbiota looks like. Although it has other uses, from this information, what can you tell about the type of infection it is used for? B. A. a patient undergoing treatment for cancer who has a history of candidiasis*. The microbial population in the gastrointestinal tract of a human is known as gut microbiota. Coagulase-negative staphylococci, dominated by Staphylococcus epidermidis, were the commonest microbe group found (83% of perso … viruses such ashuman papillomavirus are a normal part of the skin microbiome [17–21]. A) are superficial infections on the skin, hair, or nails. Microbes inhabit just about every part of the human body, living on the skin, in the gut, and up the nose. ________ is the term for inflammation of the cornea of the eye. the harsh conditions of the epidermis, in the cavities of the hair follicles and in the interiors of the sweat ducts, which make the body's microbiota. B) are not associated with changes in the normal microbiota. produce disease, particularly if they penetrate the epidermis through wounds, or when the immune system is suppressed. B. less diverse microbial populations than other regions*. Are biofilms always bacterial? Figure 21.3 The normal microbiota varies on different regions of the skin, especially in dry versus moist areas. Twelve skin sites were cultured for the associated microbiota using molecular methods detecting 16 SRNA in the three micro environments. C. It is probably used to treat parasitic infections such as those caused by helminths because they are eukaryotes.*. ________ is a streptococcal cell wall protein that is an important virulence factor. Propionibacterium acnes is a Gram-positive bacterium that forms part of the normal flora of the skin, oral cavity, large intestine, the conjunctiva and the external ear canal. The skin is an effective barrier against many pathogens. Herpes simplex virus 1 is relatively uncommon; it is estimated that about 3% of individuals in the United States have been infected. C. It varies between moist and dry areas only, but is consistent in areas of similar moisture content. The normal flora depends on the body area, type of clothes the person wears, job type and the surroundings in which he/she lives. Acanthamoeba keratitis is generally treated with which of the following? small lipophilc yeasts such as Malassezia, which digest sebum. Normal microbiota refers to the organism that colonizes the body’s surfaces without normally causing disease. Figure 1 illustrates the urinary anatomy common to females and males.The kidneys carry out the urinary system’s primary functions of filtering the blood and maintaining water and electrolyte balance. D. Trichophyton, Epidermophyton, and Microsporum fungi*. The relatively mild viral disease usually caused by human herpesvirus-6, or sometimes human herpesvirus-7, is better known as: Tineas are commonly caused by which of the following? List three identifying characteristics of Staphylococcus aureus. Individuals who wear contact lenses are at particular risk of developing which of the following? The skin is an effective physical barrier against microbial invasion. Which of the following is true of the normal skin microbiota? From sequencing information we know that microbial communities are more complex than previously Microbes are mainly present in human gastrointestinal tract and skin. D) occur in the deeper dermal layers or in muscles. A. Bacteria on the surface of the skin often gradually consume the epidermis and dermis, creating a pathway to deeper parts of the body.*. The phrase “normal microbiota ” refers to the microorganisms that reside on the surface and deep layers of skin, in the saliva and oral mucosa, in the conjunctiva, and in the gastrointestinal tracts of every human being. Why is MSA used as a selective medium for normal skin microbiota? Why is a wet mount of a KOH preparation often used to diagnose tineas? bacteria, viruses, fungi, protozoa, and arthropods are involved in, disease of other boys systems may also manifest themselves in the. Gram stain of a species of Micrococcus, commonly isolated from the skin and nasal membranes of humans. potential pathogens for nutrients and space and produce chemicals that interfere with the growth of other microbes, providing further defense against infections. Despite the importance of the mammalian microbiota, only a few skin microbiome studies have been conducted on non-human mammals (key papers included in Additional file 1: Table S1). No growth of any microbe was found in 5% of males and 15% of females. In-utero, the fetus is free of normal flora in normal circumstances; the process of being colonized (establishment of microbial growth) with normal flora typically begins during the birthing process: MO of the GI tract MO of the skin MO of the genitourinary tract. Herpes simplex virus 1 only causes lesions on and around the mouth. Related terms: Platelet; Hematopoietic Stem Cell; Bacterium Initial culture-based studies of dogs and cats reported minimal skin bacterial diversity [34]. The figure shows the major organisms commonly found in different locations of a healthy individual’s skin and external mucosa. Propionibacterium acnes, though, it is also protective. Most of the bacteria that reside on skin and hair are either commensalistic (beneficial to the bacteria but do not help or harm the host) or mutualistic (beneficial to both the bacteria and the host). Skin Flora. Can cause septicemia and systemic infections particularly those receiving total parenteral nutrition.Detection made by observing skin scrapings for bottle-shaped cells. No, because antibiotics only target harmful species and do not harm the normal microbiota Yes, because the antibiotics may encourage the growth of antibiotic-resistant species. Healthy gut microbiota … The normal flora of humans consists of a few eucaryotic fungi and protists, but bacteria are the most numerous and obvious microbial components of the normal flora. organisms of the microbiota typically grow in. Commonly associated with pathologic conditions such as boils, carbuncles, pimples, impetigo, abcesses Staphylococcus food poisoning, and wound infections, Corynebacterium diptheriae (gram + aerobic pleomorphic bacillus. Which of the following is true of the normal skin microbiota? small clusters, particularly in the armpits and between the legs where the conditions are most moist. From: Hematology (Seventh Edition), 2018. Although primarily recognized for its role in acne, P. acnes is an opportunistic pathogen, causing a range of postoperative … B. No, because antibiotics used on the skin are less toxic than those taken orally. ... Staphylococcus aureus is an opportunistic pathogens of skin. It does not change over time. Albendazole is a medication that affects the ability of organisms to use tubulin to synthesize microtubules. Start studying Micro chapter 19 Normal Microbiota of the Skin. The emphasis recognized that the majority of microorganisms inhabiting the skin were classified as viable, but non-culturable (VBNC). A. In adults, skin occupies approximately 2.4 square yards (approximately two square meters). such as yeasts are rarely pathogenic, though they can cause disease in immunosuppressed patients. Resident microorganisms Resident microbiota are found in the upper parts of the epidermis and congregated in and around the hair follicles . Common commensal on skin and can cause tinea versicolor ( a superficial infection characterized by dark lesions on ligh skin or light areas on dark skin) . Commonly demonstrated flora include; Diphtheroids, Staphylococci, E. coli, Candida albicans, etc. These microbiota are not harmful to humans; some are even beneficial and most help maintain our health. vigorous scrubbing may reduce the numbers of microorganism on the skin, but. deep in the hair follicles and sweat ducts soon recolonize the skin's susurface. Learn vocabulary, terms, and more with flashcards, games, and other study tools. No, because antibiotics used on the skin are less toxic than those taken orally. However, there are unique locations for these structures in females and males, and there is a significant amount of overlap between the urinary and genital structures in males. Choose from 337 different sets of normal microbiota flashcards on Quizlet. Microbes found on the skin may be part of the long-term normal microbiota or they may be ________ microbes. Our skin is populated by billions of diverse bacteria. Which of the following is not true of biofilms? Staphylococcus species are commonly found on the skin, with S. epidermidis and S. hominis being prevalent in the normal microbiota. Microbial flora of the skin The skin is the primary external coating of the human body. The basic structures of the urinary tract are common in males and females. B. KOH helps dissolve the keratin in the tissues, which better reveals the fungal structures.*. NIH Human Microbiome Project defines normal bacterial makeup of the body. The microbiome can also affect gut health and may play a role in intestinal diseases like irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) (25, 26, … significant members of the microbiota include. 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