Drivers of the summer influenza epidemic in New South Wales, 2018-19.
Adolescent
Adult
Case-Control Studies
Child
Child, Preschool
Epidemics
/ prevention & control
Female
Humans
Infant
Infant, Newborn
Influenza Vaccines
/ administration & dosage
Influenza, Human
/ epidemiology
Male
Middle Aged
New South Wales
/ epidemiology
Seasons
Surveys and Questionnaires
/ statistics & numerical data
Travel
/ statistics & numerical data
Travel-Related Illness
Vaccination
/ statistics & numerical data
Whooping Cough
/ epidemiology
Young Adult
Influenza
Travel medicine
Vaccination
Journal
The Medical journal of Australia
ISSN: 1326-5377
Titre abrégé: Med J Aust
Pays: Australia
ID NLM: 0400714
Informations de publication
Date de publication:
17 Jan 2022
17 Jan 2022
Historique:
revised:
16
06
2021
received:
15
01
2021
accepted:
22
06
2021
pubmed:
23
9
2021
medline:
22
2
2022
entrez:
22
9
2021
Statut:
ppublish
Résumé
To assess the extent to which the 2018-19 New South Wales summer influenza epidemic was associated with overseas or domestic travel and with seasonal influenza vaccination status. Unmatched case-control study, based on an online survey distributed from the NSW Notifiable Conditions Information Management System (NCIMS) to people for whom mobile phone numbers were available. A case was defined as a person with notified laboratory-confirmed influenza with onset of illness between 1 December 2018 and 21 March 2019. People with notified pertussis infections (confirmed or probable) were selected as controls. Notified influenza infection, by travel and contact with unwell overseas travellers in the week before onset of illness and seasonal influenza vaccination status (as the primary exposures). Valid survey responses were provided by 648 of 2806 invited people with notified influenza (23%) and 257 of 796 invited people with notified pertussis (32%). The demographic characteristics of the respondents were similar to those of the source population (7251 cases, 2254 controls). During the first two months of the summer of 2018-19, notified influenza was more likely for people who had travelled overseas or had contact with an ill overseas traveller in the week before symptom onset (adjusted OR [aOR], 6.99; 95% CI, 3.59-13.6), but not during the second two months (aOR, 1.63; 95% CI, 0.79-3.35). Influenza vaccination status was not associated with the likelihood of notified influenza. Travel-related factors were early drivers of the 2018-19 NSW summer influenza epidemic; local transmission sustained the outbreak despite unfavourable conditions later in summer. Our findings prompted re-evaluation of recommendations for pre-travel vaccination in NSW. The role of travel in out-of-season influenza outbreaks should be considered in other temperate zones.
Substances chimiques
Influenza Vaccines
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
33-38Subventions
Organisme : Australian Department of Health
Informations de copyright
© 2021 AMPCo Pty Ltd.
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