ch.14 Flashcards
mutualism
both organisms benefit, for example bacteria in the human colon
commensalism
one benefits and the other is indifferent, for example, mites in human hair follicles
amensalism
one is harmed and the other is indifferent, fungus secreting an antibiotic
parasitism
one benefits and the other is harmed, tuberculosis in human lung
microbiota
organisms that colonize the bodys surface without normally causing disease
resident microbiota
obtained during first month of life, in birth canal, don’t normally cause disease unless there is a immunodeficiency and they become opportunistic infection
transient microbiota
typically leaves after days
antimicrobial antagonism
resident microbiota can turn on transient microbiota by giving them no space, no nutrients, changing the pH
opportunistic pathogens
normal microbiota that causes disease under certain circumstances
reservoirs
sites where pathogens are maintained as a source of infection
contamination
the mere presence of microbes in or on the body, does not cause disease
infection
when organisms evades body external defenses, multiplies, and becomes established in the body
portals of entry and exit
sites through which pathogens enter and leave the body
the three major pathways are the skin, placenta, and mucous membranes
When does disease result?
if the invading pathogens alters normal body functions
symptoms
subjective characteristics of disease only felt by patient (pain, headache,dizziness)
signs
objective manifestations of disease observed or measured by others (fever, anemia, swelling)
syndrome
symptoms and signs that characterize a disease or an abnormal condition
