The Ministry of Health and Medical Services said its routine disease surveillance system has recorded a sustained rise in influenza-like illness (ILI) cases over the reporting period from 24 August to 13 September 2026.
The ministry said national surveillance data first identified unusual increases at sites in Honiara, Western Province and Malaita Province in the previous two reporting weeks.
In the most recent reporting week, surveillance sites in Central, Isabel and Makira provinces also reported increases, the ministry said. Several sites in Honiara reported a fall in the weekly number of cases.
According to the release, ILI is a syndrome that can be caused by several circulating respiratory viruses, including influenza and respiratory syncytial virus (RSV).
Laboratory testing carried out in July and August detected influenza A in most of the samples tested, the ministry said. Further testing is under way to confirm which viruses are behind the current increase.
The ministry said flu-like illnesses spread easily from person to person, particularly when an infected person coughs or sneezes. Common symptoms include fever, dry cough, body aches, runny nose and sore throat.
MHMS advised the public to wash hands regularly with soap and water or use an alcohol-based hand sanitiser, and to cover the mouth and nose when coughing or sneezing, preferably with a tissue or into the elbow.
It said people with fever, cough or acute respiratory illness should wear a surgical mask, avoid close contact with others and stay home and rest where possible.
The ministry also advised drinking plenty of water, eating fruit and vegetables, and taking Panadol as advised by a nurse or doctor, or sponging, to help reduce fever.
Medical attention should be sought if symptoms become severe, the ministry said, particularly for young children, older people, pregnant women and people with underlying health conditions.
It also advised disinfecting frequently touched surfaces and improving indoor air circulation.