Aussie flu symptoms include headaches, fevers and vomiting.
The deadly infection has swept across the UK, and has since been found in the US.
Eight-five people have died from influenza in the UK since October 5, while 27 of those came in the first week of January, according to Public Health England (PHE).
The number of cases of the Australian flu virus could continue to rise in the UK, it’s been claimed.
PHE Medical Director, Professor Paul Cosford, said: “Our data shows that more people are visiting GPs with flu symptoms, and we are seeing more people admitted to hospital with flu.
“We are currently seeing a mix of flu types, including the influenza A [H3N2] strain that circulated last winter in the UK, and then in Australia.
“The A [H3N2] strain particularly affects older, more vulnerable age groups.
“We encourage anyone who is eligible to take up their offer of the flu vaccine – it is not too late.”
Flu is caused by the influenza virus. There are three main types of the virus – A, B and C.
Influenza A and B usually cause more seasonal outbreaks. Influenza C causes less severe, milder symptoms.
Aussie flu is a mutated form of the influenza A virus, according to Jakemans pharmacist Marvin Munzu. It’s known as the H3N2 virus.
The infection has caused a number of deaths in Australia, as the Australian flu jab is ineffective against the specific strain of the virus, said Munzu.
“The Aussie flu symptoms are similar to the normal flu symptoms,” Munzu told Express.co.uk.
“The main difference being the severity and duration symptoms.
“Symptoms include headaches, fevers, muscle aches, sore throat, cough, runny nose and sneezing, which generally lasts more than a week and are more severe.”
Washing hands regularly with soap and warm water could limit the spread of the deadly Aussie flu, PHE said. Cleaning surfaces regularly could also help to lower your risk of developing the condition.