Novel Variants of Respiratory Syncytial Virus A ON1 Associated With Increased Clinical Severity of Bronchiolitis.
J Infect Dis
; 222(1): 102-110, 2020 06 16.
Article
in En
| MEDLINE
| ID: mdl-32031626
ABSTRACT
BACKGROUND:
A study of respiratory syncytial virus-A (RSV A) genotype ON1 genetic variability and clinical severity in infants hospitalized with bronchiolitis over 6 epidemic seasons (2012-2013 to 2017-2018) was carried out.METHODS:
From prospectively enrolled term infants hospitalized for bronchiolitis, samples positive for RSV A ON1 (Nâ =â 139) were sequenced in the second half of the G gene. Patients' clinical data were obtained from medical files and each infant was assigned a clinical severity score. ANOVA comparison and adjusted multinomial logistic regression were used to evaluate clinical severity score and clinical parameters.RESULTS:
The phylogenetic analysis of 54 strains showed 3 distinct clades; sequences in the last 2 seasons differed from previous seasons. The most divergent and numerous cluster of 2017-2018 strains was characterized by a novel pattern of amino acid changes, some in antigenic sites. Several amino acid changes altered predicted glycosylation sites, with acquisition of around 10 new O-glycosylation sites. Clinical severity of bronchiolitis increased in 2016-2017 and 2017-2018 and changed according to the epidemic seasons only.CONCLUSIONS:
Amino acid changes in the hypervariable part of G protein may have altered functions and/or changed its immunogenicity, leading to an impact on disease severity.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Genetic Variation
/
Severity of Illness Index
/
Bronchiolitis
/
Respiratory Syncytial Virus, Human
/
Respiratory Syncytial Virus Infections
Type of study:
Prognostic_studies
/
Risk_factors_studies
Limits:
Female
/
Humans
/
Infant
/
Male
/
Newborn
Country/Region as subject:
Europa
Language:
En
Journal:
J Infect Dis
Year:
2020
Document type:
Article
Affiliation country:
Italia