Oral Microflora: A Comparative Study in HIV and Normal Patients

Area of Science:

• Oral microbiology
• Infectious diseases
• Immunology

Background:

• Human Immunodeficiency Virus (HIV) infection is known to cause significant immune suppression.
• Opportunistic infections are common in HIV-infected individuals, often arising from commensal microorganisms.
• The oral cavity harbors a complex microbiota that can be affected by systemic health status.

Purpose of the Study:

• To compare the oral microbiota composition between normal and HIV-infected individuals.
• To identify shifts in specific bacterial species within the oral cavity of HIV patients.
• To investigate the relationship between CD4+ T cell counts and oral microflora in HIV infection.

Main Methods:

• A prospective study involving 80 subjects, divided into control and HIV groups.
• Oral microbiota analysis including isolation and colony counts of commensal microorganisms.
• Antibiotic sensitivity testing was performed.
• Correlation of oral microbiota with CD4+ T cell counts in HIV patients.

Main Results:

• HIV-infected individuals showed a shift in oral microbiota, with decreased Viridans streptococci and increased Micrococcus spp. and Klebsiella spp. compared to controls.
• In HIV patients with CD4+ T cell counts <50 cells/μl, heavy colonization by Micrococcus spp., Acinetobacter, and Klebsiella spp. was observed, with no Viridans streptococcus.
• As CD4+ T cell counts improved, Viridans streptococcus returned, and oral microbiota approached control levels at counts >300 cells/μl.

Conclusions:

• HIV infection significantly disrupts the normal oral microbiota.
• Specific commensal bacteria, like Micrococcus spp., become opportunistic pathogens in immunocompromised HIV patients.
• Restoration of oral microflora in HIV patients is linked to improved immune status (CD4+ T cell count).