Urgent warning issued over triple virus threat in Australia: 'It's never too late to get a vaccine'

Cases of whooping cough, the flu and gastroentiritis have surged, with young children particularly hard hit by the wave of illness which is putting 'unprecedented' pressure on some hospitals.

The winter peak is still yet to be reached in northern Australia popular with holiday-makers, prompting a leading general practitioner to urge everyone to get an influenza vaccination.

More than 170,000 influenza cases have been confirmed so far in 2024, with 29 per cent of them in children under nine years of age.

Infections in 2024 are already 27 per cent higher than the first six months of 2023.

Those figures do not give a complete picture as many people do not get tested, according to Royal College of General Practitioners rural chair Michael Clements.

He said cases are likely to climb as the winter virus peak hits warmer areas in August and September.

'We certainly are concerned that this is going to continue to increase and potentially overwhelm the hospital systems,' the Townsville GP told AAP.

His comments echo NSW Health Minister Ryan Park, who reported 'unprecedented' demand on emergency departments in his state due to a 30 per cent jump in flu cases, combined with fewer GPs working in the community.

Victoria's health department warns vaccine coverage of influenza remains 'low' in all age groups including children, despite a sixfold increase in emergency department presentations due to the flu from April to June.

Dr Clements said COVID-19 infections could have lowered immunity to influenza, and reduced herd immunity across the population.

He also cited more international travel and people going to work while unwell - two factors that were greatly reduced during Covid lockdowns - as factors that spread illness.

Cases of pertussis, known as whooping cough, have already surged past pre-pandemic levels to more than 12,900 so far in 2024, which is four times the number of total infections in 2023.

More than 60 per cent of cases have been in children under 14, with NSW health warning of 'unseasonably high' infections of whooping cough and pneumonia in school-aged children.

It can be deadly for babies, with Dr Clements noting many infants and adult patients with whooping cough have also tested positive to several other viruses at the same time like respiratory syncytial virus (RSV) or COVID-19.

'These are spikes, we certainly have to acknowledge that they are big increases on the last years,' he said.

'What's hard to know is how to interpret it, so whether or not we're just interpreting a return to normal behaviour post COVID.'

Cases of a particular gastroenterisis strain have also already tripled the 2023 total, surging to more than 11,700.

Cryptosporidiosis is spread by a parasite in some swimming pools, and anyone with symptoms is advised to stay out of the water for at least four weeks as they could still be shedding the virus, which can survive chlorine.

Dr Clements is concerned about what he described as the 'massive explosion' in preventable illness and said he has noticed fewer campaigns from the federal government encouraging people to get jabbed.

'We can't look into the crystal ball and say whether we're at the peak now or whether we'll have another one,' he said.

'It's never too late to get a vaccine.'