Influenza – or the flu – is a virus that spreads quickly from person to person. Symptoms include fever, chills, aches, runny nose, a cough and stomach upset. Immunisation is your best defence against the flu.
Influenza can be caused by different strains of the influenza virus. (Symptoms for different types of flu are the same.) The seasonal influenza vaccine is altered most years to cover the particular strains of the virus that are circulating each year. When a new (novel) strain of the flu virus emerges that infects many people in a very short time, it is called a ‘flu pandemic’.
The influenza virus infects your nose, throat and lungs. The flu is normally worse than a cold and spreads quickly from person to person through touch and through the air.
Symptoms of influenza come on suddenly and can include fever, chills, muscle aches, runny nose, cough and stomach upsets.
Immunisation is your best defence against influenza (flu).
In climates such as New Zealand’s, you’re more likely to get the flu in winter. Some people get very sick – in most years, influenza hospitalises thousands of people, and some lose their lives to it.
Older people, young children, pregnant women, and people with certain medical conditions are at a higher risk of developing serious complications from influenza, such as pneumonia. If you’re at higher risk, it is important to call your doctor early, to find out if you need treatment.
While you’re unwell, stay away from work or school. Look after yourself and your family – rest and fluids are especially important.
The symptoms of influenza can be the same or similar to the symptoms of COVID-19. If you are sick, stay home. Call your health provider or Healthline and follow their advice. They may advise you to have a COVID-19 test, and self-isolate while you wait for the results.
It is also important to seek medical advice early if you are concerned, and especially if there are any danger signs, even if you have been seen before. Other serious conditions can also look like the flu, including meningococcal disease.
Find out more from the Ministry
A new monitoring system that enables people to help us track flu across New Zealand.
Protect yourself from the flu – get immunised.
Developed by the Starship Foundation and the Paediatric Society of New Zealand.
Safe Travel website
Advice for travellers from the Ministry of Foreign Affairs and Trade.
Signs and symptoms of influenza can include:
- fever (a temperature of 38°C or higher)
- sore throat
- runny or stuffy nose
- body aches
- stomach upset, vomiting or diarrhoea.
It may take between 1–4 days to feel symptoms after you catch influenza.
The worst symptoms usually last about 5 days, but coughing can last up to 2–3 weeks.
High risk groups
People at higher risk of developing complications if they get influenza include:
- pregnant women and women who have just given birth
- people with an ongoing health condition (like asthma, diabetes, cancer, a heart or lung condition, and conditions that affect the nervous or immune systems)
- significantly overweight people
- people aged 65 years or over
- very young children, especially infants (under 1 year).
If you are at higher risk, or are concerned about your symptoms, it is important to seek advice early from your doctor or Healthline (ph 0800 611 116), to see if you need treatment (even if you have been seen before).
People aged 65 and over, pregnant women, people with certain chronic conditions and young children with a history of severe respiratory illness are eligible for free influenza immunisation – the list of eligible health conditions is available at the Fight Flu website.
Seek urgent medical advice if you have:
- a high fever that doesn’t come down, especially if you are pregnant
- chills or severe shaking
- difficulty breathing or chest pain
- purple or bluish discolouration of your lips, skin, fingers or toes
- seizures or convulsions
- signs of other serious conditions, such as meningococcal disease (which may include severe headache, sleepiness, vomiting, stiff neck, dislike of bright lights, and sometimes a rash).
Look out for signs of dehydration such as dizziness when standing, and not passing urine regularly.
If a person you are caring for is less responsive than normal, unusually quiet, or confused, you should call a doctor urgently.
It is also important to let your doctor know if you were starting to feel better, then get worse.
Danger signs for babies and young children
Call a doctor if your baby or child’s breathing is fast or noisy or if they are wheezing or grunting. Check if the area below the ribs sucks inward (instead of expanding as normal) as they breathe in.
You should get help if your baby or child is:
- very pale
- drowsy or difficult to wake
- severely irritable, not wanting to be held
- limp or unable to move
- if a baby has dry nappies or no tears when they are crying, it means they are dehydrated. It is important to contact a doctor
- if they have signs of other serious conditions, such as meningococcal disease (which may include severe headache, stiff neck, dislike of bright lights, and sometimes a rash, but in very young children are often non-specific such as sleepiness and vomiting).
If you have any worries about yourself or someone you are caring for, call Healthline (0800 611 116) for advice or see a doctor, even if you have called or been seen before.
Phone Healthline (0800 611 116) or your doctor if you are concerned or if you:
- feel a lot worse, or you are not getting better after a few days
- have an existing health condition or are in a high risk group (see Symptoms)
- are pregnant
- are taking any medication that affects the immune system
- are looking after someone with influenza and you are in a high risk group
If clinically indicated, your doctor may recommend antiviral medications. Take them as directed.
Caring for yourself and others
If you are unwell, stay at home and rest ideally/preferably in a separate, well ventilated room away from other people.
It is important to drink small amounts of fluids often.
Antibiotics only work against bacterial infections, not the viral infections that cause influenza.
Carefully read and follow the labels on any medication and contact your doctor or pharmacist if you have any questions
You can also:
- reduce fever by using a damp cloth on your forehead, washing the arms and body with a cool cloth, bathing in slightly warm water
- take appropriate medicines to relieve discomfort and fever if necessary.
- It is especially important to reduce fever if you are pregnant.
- gargle a glass of warm water and/or suck sugarless hard sweets or lozenges to help with sore throats
- shower or bathe regularly and keep bedding and nightwear clean and dry
- use skin balm or moisturiser to stop your lips from cracking.
Know the danger signs that mean you should seek urgent medical attention (see Symptoms).
Any child younger than 3 months who has a fever should see a doctor
Caring for babies and children
When a baby or child has influenza, it is important to do the following:
- keep the child at home resting until they are well.
- care for the child in a separate, well-ventilated room away from other people.
- increase the frequency of breastfeeding or the amount of other fluids they drink. If your child will not take fluids or is drowsy, don’t force them. Seek medical advice immediately.
- reduce fever by using a damp cloth on their forehead, washing their arms and body with a cool cloth, bathing them in slightly warm water.
- give paracetamol or ibuprofen if they have pain or discomfort in the dose recommended on the package (unless your doctor says otherwise). Aspirin should not be given to children under 14 years of age.
Saltwater drops (saline) can be used to treat a stuffy nose.
2021 influenza immunisation campaign
Immunisation is your best defence against the flu.
You can have your flu immunisation two weeks or more after your second dose of the COVID-19 vaccine.
If you are aged 65 or over, pregnant, or have a health condition such as diabetes or heart disease that puts you at greater risk of influenza, you can get vaccinated free at your general practice or a vaccinating pharmacy. It’s also important to get immunised if you are a health or disability care worker, or frontline worker. More information, including the list of eligible health conditions is available at the Fight Flu website.
Immunisation is your best defence against influenza.
For those not eligible for funded influenza vaccination and not covered by an employer-funded programme, it costs between $25 and $45 depending on the vaccine and provider.
In 2020, 1.768 million influenza vaccines made for the southern hemisphere were supplied to New Zealand, 400,000 more than were used in 2019.
In 2021, a record 2.4 million doses of influenza vaccine are being brought into New Zealand.
The 2021 vaccines will be quadrivalent influenza vaccines that contain the following four influenza strains, the first two strains are new to the 2021 vaccine:
- A/Victoria/2570/2019 (H1N1)pdm09-like virus
- A/Hong Kong/2671/2019 (H3N2)-like virus
- B/Washington/02/2019-like virus
- B/Phuket/3073/2013-like virus.
Immunisation if you’re pregnant
Pregnant women are strongly advised to be immunised as pregnancy places a woman at greater risk of complications from influenza. Influenza immunisation is free for pregnant women between May and the end of December. As in previous years, it is recommended that pregnant women get immunised before winter if possible.
Mothers who receive the influenza vaccine while pregnant can pass protection on to their baby. The vaccine offers protection to infants who would normally be too young (under 6 months) to receive immunisation individually.
Visit the Fight Flu website for facts about immunising against the flu when you are pregnant.
Stop the spread of the flu
The signs and symptoms of flu can be similar to COVID-19. If you are unwell, call Healthline or your doctor for advice about getting a COVID-19 test and whether you need to self-isolate. Stay at home until you are better.
Follow basic hygiene practices:
- Wash your hands regularly for at least 20 seconds and dry them for 20 seconds – or use an alcohol-based hand rub.
- Avoid touching your eyes, nose and mouth.
- Don’t share drinks.
- Avoid crowded places.
- Cover your mouth and nose with a tissue when you cough or sneeze – then put the tissue in a lined bin.