Question 1

Which of the following viruses is most commonly associated with the formation of multinucleate syncytia, allowing it to evade the immune system?

Accepted Answer

Paramyxovirus (Measles virus)

Question 2

A child presents with a high fever, cough, and a widespread skin rash. Examination reveals small white lesions on the oral mucosa. Which sign is considered diagnostic for this disease?

Accepted Answer

Koplik’s spots

Question 3

Which of the following best explains why measles outbreaks are more likely to occur in large, dense populations?

Accepted Answer

The virus requires a large number of susceptible hosts to maintain transmission.

Question 4

Which of the following complications is most specifically associated with measles (rubeola) infection?

Accepted Answer

Subacute sclerosing panencephalitis (SSPE)

Question 5

A 3-year-old child develops a barking cough and stridor. Laboratory testing identifies a negative-sense, single-stranded RNA virus. Which virus is most likely responsible?

Accepted Answer

HPIV-1 (Human parainfluenza virus 1)

Question 6

Which of the following is the primary method of prevention for mumps in industrialized countries?

Accepted Answer

MMR vaccine

Question 7

A patient presents with painful swelling of the parotid glands, but no other symptoms. Which virus is the most likely cause?

Accepted Answer

Mumps virus

Question 8

Which of the following statements about Respiratory Syncytial Virus (RSV) is correct?

Accepted Answer

It is the leading cause of fatal respiratory disease in infants and children.

Question 9

Which of the following best describes the mechanism by which rabies virus causes death?

Accepted Answer

Respiratory paralysis following central nervous system degeneration

Question 10

A laboratory technician is bitten by a bat and seeks medical attention. Which of the following is the most appropriate immediate intervention?

Accepted Answer

Administration of human rabies immune globulin (HRIG) and vaccination with HDCV

Question 11

Which of the following viruses is most likely to cause outbreaks of hemorrhagic fever with up to 90% mortality?

Accepted Answer

Ebola virus

Question 12

Which of the following laboratory findings is diagnostic for rabies infection postmortem?

Accepted Answer

Negri bodies in brain tissue

Question 13

Which of the following best explains why vitamin A is administered to children with measles?

Accepted Answer

It reduces the severity of the disease.

Question 14

A hospital outbreak of Ebola virus is most likely to be traced to which of the following transmission routes?

Accepted Answer

Contaminated body fluids

Question 15

Which of the following viruses is most likely to be transmitted via fomites, hands, and respiratory droplets, and is a leading cause of fatal respiratory disease in infants?

Accepted Answer

Respiratory syncytial virus (RSV)

Question 16

Which of the following is a unique feature of the measles virus compared to rubella virus?

Accepted Answer

It causes Koplik’s spots in the oral mucosa.

Question 17

Which of the following best describes the role of syncytia formation in the pathogenesis of paramyxoviruses?

Accepted Answer

It allows the virus to evade the immune system by fusing infected cells.

Question 18

A patient develops severe dyspnea and is diagnosed with RSV. Which of the following treatments is most likely to be effective in reducing viral replication?

Accepted Answer

Ribavirin

Question 19

Which of the following equations best represents the basic reproduction number ($$R_0) $$for a virus in a population, where $$\beta is $$the transmission rate, $$\gamma is $$the recovery rate, and $$N is $$the population size?

Accepted Answer

$$R_0$$ = \beta N / \gamma$$

Question 20

Which of the following best explains why vaccination is critical for the control of measles, mumps, and rubella in a population?

Accepted Answer

Vaccination provides herd immunity, reducing the effective reproduction number ($$R_e) $$below 1.

Pathogenic RNA Viruses: Enveloped, Unsegmented Negative ssRNA Viruses

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