(Single Best Answer) Question 81: The sputum specimen of a 70 year old male was cultured on a 5 % sheep blood agar. The culture showed the presence of alpha - haemolytic colonies next day. The further processing of this organism is most likely to yield ?
A) Gram positive cocci in short chains, catalase negative and bile resistant B) Gram positive cocci in pairs, catalase negative and bile soluble C) Gram positive cocci in clusters, catalase positive and coagulase positive D) Gram negative coccobacilli, catalase positive and oxidase positive Answer (Select an option above to get the answer):
A) The formation of antigen-antibody complexes with resultant complement activation and tissue damage B) The release of hyaluronidase by L.monocytogenes, which contributes to its dissemination from local sites C) The antiphagocytic activity of the L.monocytogenes capsule D) The survival and multiplication of L.monocytogenes within mononuclear phagocytes and host epithelial cells Answer (Select an option above to get the answer):
(Single Best Answer) Question 83: In HIV infected individual Gram stain of lung aspirate shows yeast like morphology. All of the following are the most likely diagnosis except ?
A) Candida tropicalis B) Cryptococcus neoformans C) Pencillium marneffi D) Aspergillus fumigates Answer (Select an option above to get the answer):
A) They are the smallest prokaryotic organisms that can grow in cell free culture media B) They are obligate intracellular organisms C) They lack a cell wall D) They are resistant to Beta-lactam drugs Answer (Select an option above to get the answer):
(Single Best Answer) Question 85: A veterinary doctor had pyrexia of unknown origin. His blood culture in special laboratory media was positive for gram negative short bacilli which was oxidase positive. Which one of the following is the likely organism grown in culture ?
A) Pasturella spp. B) Francisella spp. C) Bartonella spp. D) Brucella spp. Answer (Select an option above to get the answer):
(Single Best Answer) Question 86: Which one of the following statement is true regarding pathogenicity of Mycobacteria species ?
A) M. tuberculosis is more pathogenic than M. bovis to the humans B) M. kansasii can cause a disease indistinguishable from tuberculosis C) M. africanum infection is acquired from the environmental source D) M. marinum is resoponsible for tubercular lymphadenopathy Answer (Select an option above to get the answer):
(Single Best Answer) Question 87: A young boy had a flea bite while working in a wheat grain godown. After 5 days he developed fever and had axillary lymphadenopathy. A smear was sent to the laboratory to perform a specific staining. Which one of the following staining method would help in the identification of the suspected pathogen ?
A) Albert staining B) Zeihl - Neelson staining C) Mc Fadyean's staining D) Wayson staining Answer (Select an option above to get the answer):
(Single Best Answer) Question 88: A 40 years old woman presented to the gynecologist with complaints of profuse vaginal discharge. There was no discharge from the cervical os on the speculum examination. The diagnosis of bacterial vaginosis was made based upon all of the following findings on microscopy except ?
A) Abundance of gram variable coccobacilli B) Absence of Lactobacilli C) Abundance of polymorphs D) Presence of clue cells Answer (Select an option above to get the answer):
(Single Best Answer) Question 89: A patient complained of chills and fever following a louse bite 2 weeks before. He had rashes all over the body and was delirious at the time of presentation to the hospital and subsequently went into coma. A provisional diagnosis of vasculitis due to Rickettsial infection was made. Which one of the following can be the causative agent ?
A) Rickettsia typhi B) Rickettsia rickettsiae C) Rickettsia prowazekii D) Rickettsia akari Answer (Select an option above to get the answer):
(Single Best Answer) Question 90: A diabetic patient developed cellulitis due to Staphylococcus aureus, which was found to be Methicillin resistant on the antibiotic sensitivity testing. All of the following antibiotics will be appropriate except ?
A) Vancomycin B) Imipenem C) Teichoplanin D) Linezolid Answer (Select an option above to get the answer):