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. 1982 Feb;15(2):216–219. doi: 10.1128/jcm.15.2.216-219.1982

Differentiation of Haemophilus spp. in Respiratory isolate cultures by an indole spot test.

D F Welch, P A Ahlin, J M Matsen
PMCID: PMC272063  PMID: 7040445

Abstract

Indole spot tests using isolated, nonhemolytic colonies of Haemophilus species were positive for 90 of 151 (60%) respiratory isolates of Haemophilus influenzae, whereas 67 to 72 (93%) isolates of H. influenzae from cerebrospinal fluid and blood specimens were indole positive. Only 4 of 117 (3%) Haemophilus parainfluenzae isolates were positive for indole spot tests. Thus, indole-positive, nonhemolytic Haemophilus isolates in respiratory cultures can be presumptively identified as H. influenzae.

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Selected References

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