Influenza activity is showing signs of stabilising with microbiological indicators suggesting falling activity. There remains evidence of circulation of influenza within the community and closed settings. This prompted the issue of a CMO letter in week 49 advising that GPs may prescribe antivirals.
A Scottish addendum to the Public Health England guidance on use of antiviral agents for the treatment and prophylaxis of seasonal influenza has been published on the HPS website.
In week 3:
The rate of influenza-like illness (ILI) was at Baseline activity level (11.5 per 100,000).
The proportion of NHS24 respiratory calls was at Baseline activity level (15.3%).
The swab positivity of influenza in primary care was at Baseline activity level (17.6%, 3/17).
The swab positivity of influenza in secondary care was at Low activity level (14.7%, 133/906).
The incidence rate of influenza in secondary care was at Baseline activity level (2.8 per 100,000 population).
The number of new acute respiratory illness outbreaks with onset in week 3 was at Baseline activity level (n=1).
The number of new SARI cases admitted to ICU during week 3 was at Baseline activity level (n=1).
There was 1 new SARI death reported. The SARI case-fatality rate (CFR) reported since week 40 2019 was 15.2% (10/66) and remains below expected seasonal levels (range 22.9% - 35.6%).
The all-cause mortality excess was at Baseline activity level in week 1.
The respiratory syncytial virus (RSV) season started in week 41, peaked in week 48 (Extraordinary activity level) and is currently on a decreasing trend. The large majority of RSV detections thus far have been in those aged under 5 years. The typical RSV season lasts approximately 12 weeks and usually peaks between week 49 and week 52.