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. 1995 Apr;63(4):1153–1157. doi: 10.1128/iai.63.4.1153-1157.1995

Effect of experimental influenza A virus infection on isolation of Streptococcus pneumoniae and other aerobic bacteria from the oropharynges of allergic and nonallergic adult subjects.

R M Wadowsky 1, S M Mietzner 1, D P Skoner 1, W J Doyle 1, P Fireman 1
PMCID: PMC173127  PMID: 7890365

Abstract

Intranasal challenge with both influenza A virus and Streptococcus pneumoniae promotes otitis media with S. pneumoniae in chinchillas. We investigated whether influenza A virus infection promotes oropharyngeal colonization with S. pneumoniae and other middle ear pathogens by selectively inhibiting commensal bacteria. On study day 0, 12 allergic and 15 nonallergic adult subjects were intranasally inoculated with influenza A/Kawasaki (H1N1) virus. Every subject was infected with the virus as demonstrated by nasal shedding or seroconversion. Average upper respiratory symptom scores and nasal secretion weights from the entire subject group were elevated between days 2 and 6 (acute phase) and were not significantly different between allergic and nonallergic subjects. S. pneumoniae was not isolated from any subject prior to the virus challenge but was isolated in heavy density from 4 (15%) subjects on day 6 (P = 0.055). Staphylococcus aureus was isolated more frequently from the nonallergic subjects than from the allergic subjects on days 2 (80 versus 25%, respectively) 4, (67 versus 17%, respectively), and 6 (73 versus 25%, respectively) (P < 0.05). The isolation rates of other middle ear pathogens were not significantly different before virus challenge and during the acute and resolution phases (days 27 to 30) of the experimental infection for the entire subject group or either the allergic or nonallergic subgroup. Densities and isolation rates of commensal bacteria from the entire subject group were similar throughout the observational period. These results suggest that the virus infection promoted S. pneumoniae colonization of the oropharynx and that nonallergic persons may be more vulnerable to colonization with S. aureus than allergic persons. The altered colonization rates were not attributed to inhibition of commensal bacteria.

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Selected References

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