Lower respiratory tract infections

Which of the following is the most common cause of bronchiolitis?

• Adenovirus

• Respiratory Syncycial Virus (RSV)

• Parainfluenza virus

• Mycoplasma

Community-acquired pneumonia is most commonly associated with:

• Staphylococcus aureus

• Listeria monocytogenes

• Streptococcus pneumoniae

• Legionella pneumophila

Which of the following concerning viral pneumonias is correct?

• With the availability of tissue culture the virus is often identified within 24 hours

• Influenza, Type B is the most common isolate in the adult population

• RSV, Parainfluenza and adenoviruses are the common causes of pneumonia in children

• With the exception of immuno-compromised patients, viruses are the major causes of pneumonia in adult patients

Acute tracheobronchitis is most commonly associated with which of the following pathogens?

• Haemophilus influenzae

• Pseudomonas aeruginosa

• A virus

• Klebsiella pneumoniae

Which one of the following statements concerning Legionella pneumophila is CORRECT?

• It cannot be grown on laboratory media.

• It causes atypical pneumonia, especially in those with reduced cell-mediated immunity.

• It does not have a cell wall.

• It is part of the normal flora of the colon.

Whooping cough is a prolonged illness caused by toxins produced by the bacteria __________________.

Whooping cough is most communicable at which of the following phases?

• Catarrhal phase

• Paroxysmal phase

• Convalescent phase

_____________is a "slower process" that may result in as little as a single mutation in the viral RNA, occuring every few years in influenza A.

• Antigenic drift

• Antigenic shift