Influenza and Influenza-like Illnesses (ILI)
Summary: ILI activity and more direct indicators of influenza virus activity all increased this week, indicating influenza season has commenced.
- ILI presentations to sentinel emergency departments (EDs) and sentinel general practitioners (GPs) increased this week.
- Hospitalisations with confirmed influenza have been relatively steady over recent weeks, at around 10 per 1000 admissions.
- Influenza virus detections, notifications and test positivity rate in both sentinel and routinely collected specimens all increased this week ; influenza B viruses (80%) and influenza A/H3N2 (19%) viruses remain the dominantly detected subtypes, with very little influenza A/H1N1 circulating. The influenza B strains currently circulating are around 90% Yamagata lineage, matching the trivalent influenza vaccine strain.
- Overall non-influenza respiratory virus detections increased, and respiratory syncytial virus activity remains particularly high.
- Gastroenteritis presentations to sentinel GPs and EDs are relatively steady and consistent with levels experienced previously at this time of the year.
- Rotavirus detections increased and remain high. Rotavirus has caused recent outbreaks of gastroenteritis in residential care and childcare settings in metropolitan Perth.
Varicella and Viral Rashes
- Chickenpox and shingles presentations to sentinel EDs and GPs are near or below baseline levels.
- No cases of measles or rubella were notified.
- Several further cases of mumps have been confirmed among Aboriginal children, teenagers and young adults in the Kimberley region, including in Broome.
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