The impact of aqueous humor polymerase chain reaction and serological test results for establishing infectious uveitis diagnosis: An Indonesian experience

Abstract

Objective: To assess the clinical value of aqueous humor real-time polymerase chain reaction (RT-PCR) and serological antibody tests among uveitis patients in Indonesian cohort. Methods: In this prospective cohort study, single-plex RT-PCR analysis of aqueous samples from 86 new uveitis patients was performed to detect Mycobacterium tuberculosis, Toxoplasmosis gondii, cytomegalovirus, herpes simplex virus, varicella-zoster virus, Epstein-Barr virus, and rubella virus. Specific serological antibodies for suspected pathogens were also obtained. Comparison of PCR and serological antibodies with the initial and final diagnosis were presented. Results: The diagnostic positivity of aqueous RT-PCR in our cohort was 20% (17/86). The rate of infection as final etiological classification was higher after RT-PCR was performed (45 patients, 52%) compared to initial diagnosis based on clinical presentation alone (38 patients, 44%). In particular, the RT-PCR positivity among patients with infection as the final etiological classification was 33.33% (15/45). A significant difference in the IgG but not IgM toxoplasma value among those with ocular toxoplasmosis as the final diagnosis compared to the other etiologies were observed (3953 (IQR 2707–19562) IU/mL vs 428 (IQR 82–1807) IU/mL; p < 0.0001). Conclusion: RT-PCR analysis of aqueous fluid from uveitis patients helped confirm a third of infectious uveitis cases in Indonesia. In ocular toxoplasmosis, high IgG but not IgM antibody value might help differentiate those with other etiology.

Keywords

• Aqueous humor
• Infectious uveitis
• Polymerase chain reaction
• Immunoglobulin
• Serum