Question

21. The most common fatal nosocomial infection is: a) TB b) HIV/AIDs c) Pneumonia d) Hepatitis 22. The phrase "disease reservoir" refers to: a) Any source which harbo b) A contaminated water supply. c) A person carrying the disease but displaying no symptoms d) A person who had the disease but has recovered. rs the organism and can transmit it. 23. In the Gram stain procedure: a) The pink cells were gram positive. b) Only one color agent was used. c) The iodine served as the de-colorizer d) The purple cells were gram positive. 24. Viral organisms usually multiply by a) Mitosis b) Binary fision c) Spore formation d) A replication mechanism consisting of several steps. 25. The throat culture exercise requires a specimen from the pharynx without touching other mouth structures because: a) Saliva will interfere with the bacterial growth on the plate. b) Your gag reflex is located in the pharynx and gaging aids in expelling the pathogenic bacteria. c) The mouth contains the wrong type of organisms. d) All of the above are correct 26. An Acid-Fast stain was set up as demonstration for you in lab. This stain gives a presumptive diagnosis fo a) C. Difficile b) AIDS c) TB d) Most pneumonias

Answer 1

Answer 1: ( C) pneumonia

( It is most acquired infection during the hospitalization and can spread through ventilator)

Answer 2: (C) A person having disease but shows no symptoms. ( This is called disease reservoir as the person will act as host of the disease and can spread to many)

Answer 3: ( E) The purple cells are gram positive bacteria.

( The gram positive bacteria shows the colour of the dye but the gram negative bacteria doesn't shows the colour as it didn't get stain)

Answer 4: (D) A replication mechanism consisting of several steps.

( The virus multiple by various methods and it depends upon the tendency of the virus)

Answer 5: .(A) saliva will interfere in growth of bacteria on the plate.

( Saliva contains many enzymes i.e. digestive enzymes and these will interfere in the results)

Answer 6: ( C) Tuberculosis