Profiles of viral pathogens from individuals with acute respiratory tract infections in northern Tanzania.

OBJECTIVES

Acute respiratory tract infections (ARTIs) may be misdiagnosed due to bottlenecks in conventional diagnostics. The primary objective was to identify viral pathogens using reverse transcription real-time polymerase chain reaction (RT-PCR).

METHODS

Cross-sectional study was conducted between 2022 and 2024 at Tanzanian referral hospitals. Viral RNA was extracted from oral-nasopharyngeal swabs and amplified using multiplex and singleplex RT-PCR. Cycle threshold values ≤40 and ≤35 were considered positive for multiplex and singleplex RT-PCR, respectively.

RESULTS

We recruited 183 participants with median age of 52 years (interquartile range, 32-69). Of these, 119 (65%) were females. The majority (167 of 183, 91.3%) had no COVID-19 vaccination. Over one-third (67 of 183, 36.61%) were PCR-positive for viral pathogens. Seven viral pathogens were identified, and the more prevalent were influenza A virus (Flu A) (n = 27), SARS-CoV-2 (n = 10), and respiratory syncytial virus (n = 7). The most common co-infecting viruses were FluA + respiratory syncytial virus (n = 6), Flu A + influenza B virus + SARS-CoV-2 (n = 4), and SARS-CoV-2 + Flu A (n = 3). Elderly people (aged >65 years) were commonly infected with Flu A (n = 9) and SARS-CoV-2 (n = 5).

CONCLUSIONS

Viral pathogens are common in people with ARTIs. This study emphasizes consideration of RT-PCR in addition to conventional diagnostic approaches for identifying viral pathogens in patients with ARTIs.