Flu Complications
Most people recover from influenza within a couple of weeks, though it’s rarely a comfortable experience. However, in some cases, the flu leads to complications that require medical attention or hospitalisation.
Who is at higher risk
The Australian Immunisation Handbook identifies several groups that face a higher risk of complications from influenza. These include older adults, young children, pregnant women, and people with certain chronic medical conditions. The Handbook provides the definitive clinical guidance on which groups are considered at elevated risk and is the reference used by healthcare professionals across Australia.
It’s worth noting that complications can also occur in otherwise healthy individuals, though this is less common. Influenza is unpredictable in that regard.
The case for vaccination
Annual flu vaccination is the primary preventive measure recommended by Australian health authorities. Vaccination reduces the risk of catching influenza and, for those who do become infected, can reduce the severity of illness and the likelihood of complications developing. The Australian Immunisation Handbook outlines the evidence base for vaccination and identifies priority groups.
Relevance to the workplace
Influenza symptoms manifest within one to three days of exposure, and recovery can stretch over two weeks. In a workplace setting, this means one case can lead to multiple absences as the virus spreads through a team. For staff in higher-risk groups, the consequences of workplace exposure can be more serious than simple time off.
Employers have a practical role to play here. Offering onsite flu vaccination makes it easy for staff to get protected without taking time away from work. For those who miss the onsite clinic, pharmacy vouchers provide an alternative through over 2,000 partner pharmacies.
Workplace health obligations are outlined by Safe Work Australia. While flu vaccination is not mandated for most workplaces, providing access to it is a concrete step towards meeting duty-of-care expectations.
Further reading
For a general overview of the illness, see what is influenza. For information on the vaccine itself, including common side effects, visit our flu vaccine side effects page. The Australian Immunisation Handbook remains the authoritative source for clinical information about influenza complications and vaccination recommendations.
To discuss a flu vaccination program for your workplace, request a quote or get in touch.
Last updated: 18 May 2026