Author: Anonymous

Items are selected out of a bin, one by one, until one is deformed. Let the random variable X = the number of items selected until a deformed item is found.  Does the random variable X follow a binomial distribution? 

Compute using the function as goes from 1 to .

All of the following organisms can be transmitted through contact with an infected animal source.  Which of the following organisms is transmitted from contact with wild rabbits?

 Of the following, which is a facultative anaerobe that is a GNR, has a musty or mushroom smell, is fastidious, is commonly transmitted through animal bite wounds, and possesses the following characteristics: Catalase        pos Nitrate         pos TSIA           A/A with no gas Indole          pos Oxidase        pos Penicillin       Susceptible MacConkey    no growth

An organism is isolated from the endotracheal tube of a patient receiving chemotherapy The gram negative bacillus grows  on BAP and MacConkey – the MAC plate is shown here. The isolate is motile, oxidase positive, and biochemically an oxidizer. Which of the following is the likely etiologic agent? Exam 1 Image 5.jpg

 The following results are obtained from a gram-negative rod isolated from an intra-abdominal abscess: grown under anaerobic conditions: 1-mg kanamycin disk           resistant 5-mg vancomycin disk         resistant 10-mg colistin disk             resistant bile disk                           resistant LKV agar                          positive Indole                             negative Catalase                           positive The likely identity of this organism is:

You are reading a MIC for vancomycin.   The dilution series in mcg/ml is 64, 32, 16, 8, 4, 2, and 0.  The tubes are turbid (i.e., cloudy) from the 0 through the 8 mcg/ml tubes.  The dilution tubes from 16 through 64 mcg/ml are clear.  The MIC for this organism would be reported as:

 A wound culture grows colorless colonies on MacConkey agar.  O-F glucose media were inoculated with the isolate.  The results are: Open tube = green Closed tube  = green The correct interpretation of the results is that the organism:

The image below shows a direct Gram stained smear of a sputum sample submitted for culture from a 75 year old man who has history of alcoholism. Based on your observation, your interpretation of the direct sputum smear would be Sputum with epi cells(1).jpg

A non-motile, gram-positive rod is recovered under anaerobic conditions from an abscess.  The organism has a “boxcar” microscopic morphology, produces a double zone of hemolysis on BAP, produces a positive Naegler reaction, and has a zone of precipitation around colonies growing on egg yolk agar. The most likely agent is: