The number of people contracting the flu has risen in recent weeks are those in at-risk groups who have not already done so, are being urged to get themselves vaccinated against the illness.

According to the Health Protection Surveillance Centre (HPSC), reported cases of influenza-like illness (ILI) rose from 11 per 100,000 of the population during the last week of November to 18 per 100,000 in the first week of December.

"Influenza A (H3) is currently the main influenza virus circulating in the community and influenza is expected to increase over the coming weeks and circulate for at least the next six to eight weeks," the centre said.

Pharmacists nationwide have also seen a ‘spike in respiratory and cold and flu-like symptoms in the last two weeks', according to the Irish Pharmacy Union (IPU).

"There are a number of viruses circulating at this time of year and many are very hard to shift. Antibiotics do not cure the viral cold or flu. It is best to treat a cold or flu by resting, staying warm and keeping well hydrated. People can also speak to their pharmacist for personalised advice about using non-prescription medicines to ease their symptoms," commented pharmacist, Ann Marie Horan, of the IPU.

Both the HPSC and the IPU appealed to people in at-risk groups to get themselves vaccinated against the flu if they have not already done so. Those at risk include people over the age of 65, pregnant women, people with chronic illnesses that require regular medical follow-up, such as chronic lung disease, chronic heart disease and diabetes, and residents of nursing homes and other long-stay facilities.

Flu is highly contagious and the flu season lasts from October until April.

If you are in an at-risk group and have a medical card, the flu vaccine is available free of charge from GPs to people of all ages, and from pharmacists to people over the age of 18.

If you are at risk but do not have a medical card, the vaccine is still free but your GP or pharmacist may charge an administration fee.

"It is important to remember that flu is an extremely contagious respiratory illness and can lead to serious illness, even death, particularly for elderly patients and those suffering from chronic illnesses or a weakened immune system. The flu vaccination is the best way to reduce your chances of getting seasonal flu and spreading it to others," Ms Horan said.

For more information on how to look after yourself if you have the flu, or other common illnesses such as a cold or sore throat, click here