Rev Esp Quimioter 2021;34(5):468-475

Prevalence of microbiologically-confirmed influenza in patients with influenza-like illness in primary care and clinical and epidemiological characteristics

ANA MORAGAS, ANA GARCIA-SANGENÍS, ALEX PRATS ESCUDERO, CAROLINA BAYONA FARO, ROSARIO HERNÁNDEZ IBÁÑEZ, CARLOS BROTONS, TERESA VILELLA, MIREIA PUIG, ROSA FREIXEDAS CASAPONSA, SILVIA COBO GUERRERO, HELENA PERA, ALIKE W VAN DER VELDEN, CHRISTOPHER C. BUTLER, CARLES LLOR

Published: 13 June 2021

http://www.doi.org/10.37201/req/032.2021

Objectives. We evaluated the prevalence of microbiologically-confirmed influenza infection among patients with influenza-like symptoms and compared the clinical and epidemiological characteristics of patients with and without influenza infection.
Methods. Retrospective study of a cohort of patients with influenza-like symptoms from 2016 to 2018 who participated in a clinical trial in thirteen urban primary centres in Catalonia. Different epidemiological data were collected. Patients rated the different symptoms and signs on a Likert scale (absent, little problem, moderate problem and severe problem) and self-reported the measure of health status with the EuroQol visual analogue scale. A nasopharyngeal swab was taken for microbiological isolation of influenza and other microorganisms.
Results. A total of 427 patients were included. Microbiologically confirmed influenza was found in 240 patients (56.2%). The percentage of patients with moderate-to-severe cough, muscle aches, tiredness and dizziness was greater among patients with microbiologically confirmed influenza. The self-reported health status was significantly lower among patients with true flu infection (mean of 36.3 ± 18.2 vs 41.7 ± 17.8 in patients without influenza; p<0.001).
Conclusion. Clinical findings are not particularly useful for confirming or excluding the diagnosis of influenza when intensity is not considered. However, the presence of moderate-to-severe cough, myalgias, tiredness and dizziness along with a poor health status is more common in patients with confirmed flu infection.

Rev Esp Quimioter 2021;34(5):468-475 [Texto completo PDF]