Influenza A(H1N1)pdm09 infection and viral load analysis in patients with different clinical presentations
Mem. Inst. Oswaldo Cruz
;
115: e200009, 2020. tab, graf
Article
Dans Anglais
| LILACS, SES-SP
| ID: biblio-1135259
ABSTRACT
BACKGROUND Influenza viral load (VL) can be a decisive factor in determining the antiviral efficacy in viral clearance. OBJECTIVE This study aimed to evaluate the rate of infection and the role of influenza VL on the clinical spectrum of illnesses among different patient groups attended at a tertiary hospital in Brazil. METHODS Samples were collected from patients presenting acute respiratory infection from 2009 to 2013. Overall, 2262 samples were analysed and distributed into three groups (i) asymptomatic (AS); (ii) symptomatic outpatients (OP); and (iii) hospitalised patients (HP). VL (expressed in Log10 RNA copies/mL) was calculated through a quantitative real-time one-step reverse transcription-polymerase chain reaction (RT-PCR) assay aimed at the M gene, with human RNAseP target as internal control and normalising gene of threshold cycle values. FINDINGS A total of 162 (7.16%) H1N1pdm09 positive samples were analysed. Patients aged from 0.08 to 77 years old [median ± standard deviation (SD) 12.5 ± 20.54]. Children with 5 to 11 years old presented the highest detection (p < 0.0001). AS patients had the lowest VL, with a significant difference when compared with symptomatic patients (p = 0.0003). A higher VL was observed within two days of disease onset. Ten patients (HP group) received antiviral treatment and were followed up and presented a mean initial VL of 6.64 ± 1.82. A complete viral clearance for 50% of these patients was reached after 12 days of treatment. MAIN CONCLUSIONS It is important to evaluate AS patients as potential spreaders, as viral shedding was still present, even at lower VL. Our results suggest that patients with underlying diseases and severe clinical symptoms may be considered for prolonged viral treatment.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Infections de l'appareil respiratoire
/
Grippe humaine
/
Sous-type H1N1 du virus de la grippe A
Limites du sujet:
Adolescent
/
Adulte
/
Adulte très âgé
/
Enfant
/
Enfant d'âge préscolaire
/
Femelle
/
Humains
/
Bébé
/
Mâle
/
Nouveau-né
langue:
Anglais
Texte intégral:
Mem. Inst. Oswaldo Cruz
Année:
2020
Type:
Article
Institution/Pays d'affiliation:
Hospital São Paulo/BR
/
Universidade Federal de São Paulo/BR
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS