Microbiology PRC 2007 Flashcards
The virus plaque is analogous to the
Bacterial colony
The release of viral progeny of naked viruses is usually through:
Cell lysis
What do you call the stage of growth where there is a slow loss of cells through death that is just balanced by the formation of new cells through growth and division?
Maximum stationary
Viropexis is a process of penetration and is a term used to describe:
Membrane fusion
Tinea versicolor is a superficial skin infection characterized by hypopigmented areas. The causative fungi is:
Malasezzia furfur
What specimen should not be refrigerated after collection even if it cannot be processed at once?
Blood
Changes in the regulation of cellular gene expression may occur following infection with:
Oncogenic viruses
A 30 year old man had knee surgery following a car accident. A few days after the surgery, the suture line was noted to be infected. Lab report showed gram positive coccus, coagulase positive, catalase positive Beta hemolytic. The organism is:
Staphylococcus aureus
A 45 year old male was complaining of on and off epigastric pain. The gastroenterologist had a gastroscopy and demonstrated gastritis histologically and Giemsa stains showed curved spiral organisms and are gram negative. This organism is:
Salmonella
The staphylococci produce a toxin which is responsible for the staphylococcal scalded syndrome, Ritter’s disease. This resides in:
Exfoliation
CSF is collected in three vials for laboratory examination. Which vial should not be used for bacteriology?
Vial 1
Koplik’s spots are pathognomonic of:
Measles
The most common infection due to beta hemolytic streptococcus is:
Scarlet fever
In general, viruses that are medically important are considered biosafety level?
2
There are four important genera of gram positive rods (Corynebacterium, Clostridium, Listeria, Basifica). Which is anaerobic?
Listeria
A 30 year old woman undergoing chemotherapy for acute lymphocytic leukemia came to the OPD complaining of small vesicular eruptions across her left breast. The eruptions progressed to ulceration and crusted pustules. She has a similar experience about a year before. This person could be suffering from:
Shingles
The first virus discovered was
Tobacco mosaic virus
The release of progeny enveloped viruses usually involve
Budding
What fungal disease presents with raised colored cauliflower like lesions and with sclerotic bodies in tissue specimens
Chromomycosis
The essential antigen in pneumococcus that protects the organism from phagocytosis and is used to classify into specific antigenic types is
Capsular polysaccharide
A 22 year old male complained of sore throat with fever and lymphadenopathy. There is lymphocytosis with atypical cells in sheep cell agglutination. The probable diagnosis is
Infectious mononucleosis
A 42 year old post kidney transplant patient developed fever and pneumonia with marked neutropenia. Bronchial washings showed dichotomously branching filamentous fungi. The fungi involved is
Chlamydia
A 30 year old male has been receiving clindamycin for an aerobic infection. He developed intractable diarrhea with abdominal pain. Colonoscopy showed yellow white pseudomembrane and an exotoxin was identified in the stool. We are probably dealing with?
Clostridium difficiae
The incubation period of influenza is commonly
2-4 days
