The most commonly isolated yeast in clinical specimens is:

A
Candida infections are caused by a variety of species. Although C. albicans is the most com-monly isolated yeast, other species are emerging such as Candida glabrata, Candida parapsilosis, C. tropicalis, C. dubliniensis, and C. krusei. The frequency with which these are isolated varies by institution. Until recently, C. albicans was the most common yeast isolated from infections, constituting at least 60 to 70 of the infections. In the last decade, epidemiologic data reveal a paradigm shift in Candida infections. Studies in the intensive care environment are now confirming an increase of C. glabrata and C. krusei isolated in approximately 25 of the infec-tions and C. albicans in approximately 50 of the infections.

- - - - - - - - - - - -

B
For optimal cultivation of Mycobacterium spp. from most specimens, cultures are incubated at 35C in the dark in an atmosphere of 5 to 10 CO2 and high humidity. If specimens are ob-tained from skin or superficial lesions suspected to contain Mycobacterium marinum or Myco-bacterium ulcerans, then an additional set of solid media should be inoculated and incubated at 25C to 30C. In addition, a chocolate agar plate or the placement of an X-factor (hemin) disk on conventional media and incubation at 25C to 33C are needed for the recovery of Mycobacte-rium haemophilum.

- - - - - - - - - - - -

A
The primary reservoir is infected humans. The transmission of leprosy occurs person to person through inhalation or contact with infected skin. It appears that inhalation of M. leprae dis-charged in nasal secretions of an infected individual is the more important mode of transmission.

- - - - - - - - - - - -

B
The eggs of the organism A. lumbricoides are ingested and hatch in the duodenum, penetrate the intestinal wall, and migrate to the hepatic portal circulation. The adult worms live and reproduce in the lumen of the small intestine. Geographic distribution is associated with climate and poor sanitation.

- - - - - - - - - - - -

A
Classic pertussis is usually a disease of children and can be divided into three symptomatic stag-es: catarrhal, paroxysmal, and convalescent. During the catarrhal stage, symptoms are the same as a mild cold with a runny nose and mild cough; this stage may last for several weeks.

Above and beyond my expectations for this site