Three more deaths have been linked to influenza A, bringing the total number of deaths this season to 16, the health ministry announced on Tuesday.
The patients were hospitalised in various hospitals for 13 to 57 days and two of them suffered from other health problems.
Since December last year 58 serious incidents of the flu were reported to the ministry. Most of them have been discharged from hospitals by now.
In the past week, the number of cases has declined significantly, the health ministry said, but the virus is still active and is expected to remain so until the end of the month.
At the moment, four serious cases are being treated in intensive care units but no major incidents have been admitted in the past two days.
Vaccination is the best way to protect vulnerable groups, including those suffering from chronic diseases, diabetes, and heart and kidney problems, the ministry reiterated.
There are sufficient vaccines available for those who want to be vaccinated. Persons under the age of 65 need to bring a prescription from their doctor.
The general public should take preventive measures such as washing their hands, keeping premises well aired and avoiding being close to coughing and sneezing people.
When children are sick they should be kept at home for at least 48 hours after the symptoms have subsided.