Exam 31: Haemophilus

Isolates from an ear swab that are gram-negative coccobacilli grow on chocolate agar in CO₂ but not blood agar, require both X and V factors for growth, and are nonhemolytic on rabbit or horse blood may be identified as:

Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as:

Although a useful test in the past, the particle agglutination assay for the detection of H.influenzae, type b, capsular polysaccharide antigen is no longer reliable because of:

With one exception, species of the genus Haemophilus require which of the following media ingredients for in vitro growth?

A 6-year-old boy was diagnosed with purulent conjunctivitis caused by a species of Haemophilus.What would the biochemical profile of the organism be?

Growth of most Haemophilus species in culture is enhanced by:

Isolates from cerebrospinal fluid (CSF)or respiratory tract specimens that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not on blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as:

The sputum of a 75-year-old man with chronic lung infections yields the following: • Many gram-negative coccobacilli in Gram stain • X and V factors required for growth • Nonhemolytic on rabbit blood agar The organism can be identified as:

Of the following media, which provides the NAD necessary for the growth of Haemophilus spp.?

To increase the sensitivity of direct Gram-stain examination of body fluid specimens, the specimens are usually:

The virulence of this organism, which causes chancroid, is most likely attributed to:

Which of the following media provides the factors necessary for the growth of Haemophilus spp.?

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be observed growing on sheep blood agar close to colonies of:

Chancroid is the sexually transmitted disease caused by:

Which of the following opportunistic organisms is associated with slowly progressive subacute bacterial endocarditis?

Haemophilus ducreyi requires what special media to grow?

H.influenzae can be distinguished from H.aegyptius by its _____ test for _____.

Performance of the "factor requirement test" for Haemophilus involves the:

Among H.influenzae strains, group designations (e.g., type b)are based on:

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be observed growing on sheep blood agar close to colonies of bacteria that can produce: