Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?

a. Pericoronitis

b. Herpetic stomatitis

c. Lateral periodontal abcess

d. Acute necrotizing ulcerative gingivitis

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2) During AIDS, HIV infects?

a. CD2 lymphocytes

b. CD4 lymphocytes

c. B Lymphocytes

d. CD3 lymphocytes

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3) Which of the following organisms is most likely to be implicated in dental caries?

a. Staphylococcus aureus

b. Escherichia coli

c. Streptococcus sorbinus

d. Staphylococcus epidermidis

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4) Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Meningititis

c. Herpes labialis

d. Herpetic gingivostomatitis

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5) Main causative organism of chicken pox is?

a. Fox virus

b. Varicella Zoster virus

c. Mumps virus

d. Measles virus

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6) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are Gram-positive pleomorphic rods

c. Are isolated from many extra oral sites

d. Are aggressive periodontal pathogens

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7) Herpagina is usually cause by?

a. Hepatitis A virus

b. Group B coxackieviruses

c. Cytomegalovirus

d. Group A coxsackieviruses

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8) Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Phosphate

b. Hemolysin

c. Hyaluronides

d. Streptokinase

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9) Fusobacterium Nucleatum 😕

a. Black pigmented Gram-negative microorganism

b. Implicated in Dental caries

c. Plays a crucial role in the beginning of periodontal disease

d. Cause scarlet fever

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10) Coxsakievirus have been found to replicate in the?

a. Submucosal lymph tissue

b. Reticuloendothelial system

c. Small bowel

d. Sensory nerve

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11) Certain strains of Streptococcus mutans?

a. Are cause of infective meningitides

b. Cause of periodontal disease by the production of lactic and acids from fermentation of sugars

c. Extracellular glucan production.

d. Cause dental caries by the production of lactic and other acids, from fermentation of sugars

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12) Cryptococcosis?

a. Is associated with dog lovers

b. Is an infection caused by Cryptococcus neoformans

c. Can cause cardiac abnormalities

d. Is a localized inflammation around and under the nails

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13) Causative agent of scarlet fever?

a. Staphylococcus aureus

b. None of these

c. Streptococcus pyogens

d. Streptococcus viridans

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14) There are many different types of bacteria normally present in the oral cavity. Which of the following is the name of the one most likely to be associated with the onset of dental caries?

a. Lactobacillus

b. Streptococcus

c. Bacteroides

d. Staphylococcus

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15) A patient attends the surgery with bilateral swelling of the parotid salivary glands. Which condition are they suffering from?

a. A. Measles

b. Poliomyelitis

c. Rubella

d. Mumps

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16) Which of the following statements on Actinomycetes are not true?

a. It is a eukaryote

b. Short rods, but often pleomorphic

c. It causes chronic granulomatous infections

d. It infrequently causes actinomycoses of the jaws after tooth extractions

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17) Which of the following statements on Prevotella Intermedia are true:?

a. Black pigmented Gram-positive

b. Implicated in periodontal disease in association with P. gingivalis

c. Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans.

d. Microaerophilic

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18) Acute necrotizing ulcerative gingivitis (ANUG) or trench mouth is caused by a mixed bacterial infection such as?

a. Fusobacterium nucleatum and Streptococcus mutans

b. Fusobacterium nucleatum and Actinomyces viscosus

c. Fusobacterium nucleatum and Spirochetes

d. Staphylococcus aureus and Streptococcus mutans

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19) The virulence of Porphyromonas gingivalis is partly due to?

a. Cytotoxins

b. Adhesins

c. Proteases, haemolysin and collagenase

d. Hyaluronic acid

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20) Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Group A infect: skin and mucous membranes

c. Cause of infectious mononucleosis

d. Betaherpesvirus subfamily of herpesviruses

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21) There are some main routes of infection in oral cavity, which one is inexact?

a. Transferred through the air on dust particles or water droplets

b. Required by transient flora

c. Transferred by insects bite.

d. Transferred by hands or objects

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22) AIDS virus is ?

a. Enterovirus

b. RNA virus

c. DNA virus

d. Retro virus

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23) The organisms most commonly associated with root caries are ?

a. Actinomyces viscosus

b. Fusobacterium Nucleatum

c. Porphyromonas gingivalis

d. Staphylococcus aureus

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24) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mutans

c. Staphylococcus aureus

d. Streptococcus mitis

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25) Various viral infections are of relevance to the dental team, including those that cause disease affecting the head neck region. Which one of the following viruses causes cold sores?

a. Epstein-Barr

b. Paramyxovirus

c. Herpes simplex

d. Herpes zoster

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26) Mumps virus is belonging to?

a. Paramyxoviridae

b. Orthomyxoviridae

c. Retroviriae

d. None of these

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27) Actinobacillus actinomycetemcomitans possesses certain virulence factors that enable it to invade tissues, such as ?

a. Streptodornas

b. leukotoxin A

c. hemolysine

d. Hyaluronidase

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28) Fusobacterium Nucleatum 😕

a. Produce proinflammatory cytokines and up-regulating the inflammatory response

b. Gram-positive, strictly anaerobic

c. Non capsulate diplococci

d. Isolated from monomicrobial infections

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29) Which of the following statement on Actinobacillus actinomycetemcomitans are true?

a. Aggressive forms of periodontal disease in adolescents

b. cigar-shaped bacilli

c. Aggressive forms of dental caries in adolescents

d. Non-capsulate diplococcic

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30) Elderly patients sometimes present with a fungal infection of the palate, beneath a denture,referred to as denture stomatitis. Which organism causes this condition?

a. Actinomyces

b. Candida albicans

c. Herpes simplex

d. Staphylococcus aureus

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