Category: E

  • Enterobacter aerogenes

    Second species in the genus, formerly known as Aerobacter aerogenes. Ferments inositol and adonitol. A species that occurs normally in the intestines of humans and other animals and is found in decayed matter, on grains, and in plants. It causes opportunistic infections of the urinary tract and of the intestine when antibiotic therapy diminishes other…

  • Enrichment media

    Bacteriological culture media designed to encourage growth of a selected group of bacteria (e.g.. Salmonella) while inhibiting unwanted organisms (e.g., Esch. coli) in a mixed inoculum such as faeces. Enrichment media are usually fluid. After incubation the enriched culture is sub-cultivated on solid medium.  

  • Ellner’s medium

    Buffered yeast-extract peptone water medium for inducing spore formation in Cl. welchii.  

  • Elek’s medium

    Buffered urea solution which is Nesslerized after addition of a grown culture of enterobacteria, urease activity being indicated by a yellow colour.  

  • Economic index

    A statistical measure of the economy. One such index is the consumer price index.  

  • Explicit

    Specifically stated. For example, if there are conditions tied to one’s income which state that nothing can be spent on travel, that is an explicit limitation. If there are no conditions, but the income will not permit both a vacation trip and painting the house, the necessity for choice (or establishing priorities) is implicit; it…

  • Expenditure target

    A goal for attempting to hold down the rate of growth in expenditures. Such a target may be mandated by law and limit the payments which may be made, for example, to a physician in a given year. One such target is the Medicare Volume Performance Standards (MVPS).  

  • Exclusive provider organization

    An alternative delivery system (ADS) for health care which is a cross between a health maintenance organization (HMO) and a preferred provider organization (PPO). As in PPOs, the providers are paid on a fee-for-service basis and generally the providers are not at risk. However, beneficiaries have less freedom in obtaining their care from providers outside…

  • Exclusive dealing

    An agreement between a seller and buyer, for the seller to sell only to the buyer (or the buyer to buy only from the seller). When such an arrangement unfavorably affects competition, it may violate the federal antitrust laws.  

  • Evaluation of care

    Assessment of the degree to which care measures up to accepted standards.