microbio chapter 13 (copy)

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168 Terms

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equilibrium

the human body exists in a state of dynamic

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biofilms

many interaction between human body and microorganisms involve the development of

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“give and take”

colonization of the body involves a constant

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microbes

provide a protective and stabilization effect on body surfaces; are involved in maturation of host defenses and development; can invade and grow in sterile tissues, causing disease

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infection

pathogenic microorganisms penetrate the host defenses, enter the tissues and multiply

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disease

the pathologic state that results when something damages or disrupts tissues and organs

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infectious disease

the disruption of a tissue or organ caused by microbes or their products

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resident biota

the human as a habitat

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normal (resident) biota

microbes that engage in mutual or commensal associations with humans

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normal (resident) biota

microflora, indigenous flora, microbiota

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metagenomics

being used to identify the microbial profile inside and on humans; human microbiome project

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host

any organism that harbors another organism

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symbiosis

an association between 2 or more species

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mutualism

both members of the association living together benefit for the relationship

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commensalism

two species live together in a relationship such that one and the other one neither benefits nor is harmed

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parasitism

one organism , the parasite benefits from the relationship, whereas the other organism, the host, is harmed

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microbe-free

internal organs, tissue, and fluids are

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resident microbes

most areas of the body in contact with the outside environment harbor

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transients

microbes that occupy the body for only short periods

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residents

microbes that become established

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health, age, diet, hygiene, hormones, drug therapy

biota can fluctuate with

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microbial antagonism

many times bacterial biota benefit the human host by preventing the overgrowth of harmful microorganism

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compromised immune systems

hosts with ____ could be infected. by their own biota

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endogenous infections

caused by biota that are already present in the body

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microbe-free

internal organs and tissues and fluids are

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just before birth when mucus plug come out

uterus and contents are normally sterile and remain so until

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pathogen

a microbe whose relationship with its host is parasitic and results in infection and disease

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pathogenicity

type and severity of infection depend on___of the organism and the condition of the host; an organism’s potential to cause infection

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true parthogens

capable of causing disease in healthy persons with normal immune defenses

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true pathogens

influenza virus, plague bacillus, malarial protozoan

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opportunistic pathogens

cause disease when the host’s defenses are compromised or when they grow in part of the body that is not natural to them

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opportunistic pathogens

pseudomonas sp and Candida albicans

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skin

largest and most accessible organ

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transients

cling to the surface but do not grow there; influenced by hygiene- multiply on top epidermis layer of the skin

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residents

stable, predictable, less influenced by hygiene primarily bacteria and yeasts- multiply on the deep layer of the epidermis

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dermis layer of the skin

no microbes should be present in the

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GI tract

is a long hollow tube, bounded by mucous membranes; receives, moves, digest, and absorbs food and removes waste

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oral cavity, esophagus, stomach, small intestine, large intestine, rectum and anus

GI tract includes

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variations in flora distribution

due to shifting conditions like pH, oxygen tension and anatomy

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cheek epithelium, gingiva, tongue, floor of mouth, tooth enamel

most diverse and unique flora of the body

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S. sanguis, S. salivarius, S. mitis

the most common residents are aerobic streptococcus species

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teeth eruption

establishes anaerobic habitat in the gingival crevice favoring colonization by anaerobic bacteria

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fermentation of waste material in the feces

generates vitamins (B12, K, pyridoxine, riboflavin, and thiamine) and acids( acetic, butyric and propionic)

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bacterial digestive enzymes

convert disaccharides to monosaccharides or steroid metabolism

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skatole, amines and gases

contribute to intestinal odor

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oral streptococci

first organisms to colonize

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staphylococcus aureus

nasal entrance, nasal vestibule, anterior nasopharynx

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neisseria species

mucous membranes of nasopharynx

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assorted streptococci and haemophilus

tonsils ans lower pharynx

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vagina and outer opening of uretha

sites that harbor microflora in females

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anterior uretha

sites that harbor microflora in males

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urine

kidney, urether, bladder and upper uretha kept sterile by

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composition of normal flora

changes in physiology influence

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normal flora

is essential to the health of humans; create an environment that may prevent infections and can enhance host

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antibiotics, dietary changes, disease

may alter flora

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probiotics

introducing known microbes back into the body

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avoiding phagocytosis

avoiding death inside phagocyte

evading actions of the immune system

surviving host defenses

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direct damage

toxins, enzymes, lysis

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indirect damage

host response is inappropriate and excessive

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virulence of the pathogen

severity of the disease depends on the

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virulence factor

characteristic or structure that contributes to the ability of a microbe to cause disease; pathogenicity is dependent on this

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portals of entry

characteristic route a microbe follows to enter the tissues of the body

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exogenous agents

originate from source outside the body

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endogenous agents

already exists on or in the body(normal flora)

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portals of entry in skin

nicks, abrasions , punctures, incisions    

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portals on entry in GI tract

contaminated food, drink and other ingested materials

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portals of entry in respiratory tract

oral and nasal cavities

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portals of entry in the urogenital tract

sexual, displaced organisms 

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infectious dose(ID)

minimum number of microbes required for infection to proceed

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greater virulence

microbes with small IDs have

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infection

lack of ID will not result in

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adhesion

microbes gain a stable foothold at the portal of entry; dependent on binding between specific molecules on host and pathogen

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neisseria gonorrhoeae

gonorrhea; Type IV pili attach to genital epithelium. 

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escherichia coli

diarrhea; Well-developed fimbriae adhere to intestinal cells. 

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shigella and salmonella

gastroenteritis; Fimbriae attach to intestinal epithelium. 

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vibrio cholerae

cholera; Glycocalyx anchors to intestinal epithelium.

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infleunza virus

influenza; Viral spikes dock to respiratory receptors.

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HIV

AIDS; Viral spikes adhere to white blood cell receptors.

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exoenzymes

bacteria produce extracellular enzymes that dissolve and penetrate through or between cells to invade underlying tissues

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toxins

secreted by bacteria damage target cells, which die and begin to slough off

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blocked phagocytic response

bacteria have a property that enables them to escape phagocytosis and continue to grow and cause further infections

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toxin

specific chemical product of microbes, plants, and some animals that has poisonous effects on other organ

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toxinoses

adverse effects of toxins

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toxemias

when the toxin is spread by the blood from the site of infection (tetanus, diphtheria)

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intoxications

caused by ingestion of toxins (botulism

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endotoxins

not secreted, but released after the host cell is damaged- top of outer membrane of gram negative cells (LPS)

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exotoxins

secreted by a living bacterial cell into the infected tissue; Strong specificity for a target cell, disrupting its membrane

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hemolysis

disrupt membrane of red blood cells

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A-B toxins

A-active ,B-binding

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physiological effects of exotoxins and endotoxins

fever, malaise, aches, shock- released after cell is damaged, not specific 

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toxoid

is an inactivated toxin used in vaccines.

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antitoxin

is an antibody that reacts specifically with a toxin.

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incubation period

time from initial contact with the infectious agent to the appearance of first symptoms; agent is multiplying but damage is insufficient to cause symptoms; several hours to several years

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prodromal stage

vague feelings of discomfort; nonspecific complaints- headaches, muscle aches, stomach aches

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period of invasion

multiplies at high levels, becomes well-established; more specific signs and symptoms- greatest toxicity, greater symptoms 

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convalescent period

as person begins to respond to the infection, symptoms decline- going back to homeostasis/ normal. Getting better. If someone dies then its called terminal illness 

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localized infection

microbes enter the body and  remains confined to a specific tissue- warts 

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systemic infection

infection spreads to several sites and tissue fluids usually in the bloodstream- chicken pox, measles, syphillis

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focal infection

when infectious agent breaks loose from a local infection and is carried to other tissues- tuberculosis 

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mixed infection

several microbes grow simultaneously at the infection site -polymicrobial