Warning over contagious virus in possible tripledemic Source: (https://bit.ly/3EM6flF) Amid concerns that Covid may return in full force this winter along with rising flu cases, threatening to put extra pressure on health services, an expert has told Express.co.uk that there is another virus that poses a greater risk to children that could be added into the mix. Respiratory Syncytial Virus Infection (RSV) is an infection that's normally mild, but can cause pneumonia and swelling of the airwaves in babies, the elderly, and vulnerable people. While mild in some cases, it is the leading cause of infant hospitalisations in the UK and close to a third of under-fives with respiratory symptoms swabbed as part of UKHSA surveillance test positive. With Covid and flu threatening to trigger a "twindemic", as some experts have warned, high vaccination levels have meant that large swathes of the population are well protected from the two diseases. But both viruses are also unlikely to cause severe illness in young people. But Prof Francois Balloux, Director, UCL Genetics Institute said that RSV is a completely different story. He told Express.co.uk: "RSV is a leading cause of child hospitalisation and the virus kills over 100,000 children each year globally. That's more than 50 times as many children than those who died from Covid throughout the pandemic. It's a far bigger threat to young children than Covid or seasonal flu." And he warned that it may be difficult to prevent the spread unless action is taken to roll out a vaccine as soon as possible, or else "disruptive measures" will need to be taken if cases continue to rise. He said: "RSV is highly contagious and the majority of children experience an RSV infection before the age of 2 years. It's not obvious that its spread can be suppressed without enforcing highly disruptive measures. There is hope RSV child hospitalisations and deaths will decrease in the future with new RSV vaccines being rolled out soon." Recent figures from the UK Health Security Agency indicate nearly a third of under-fives currently have RSV, with 7.4 percent of the general population infected with the disease overall. With cases of this disease rising, it comes at the same time as flu levels have hit levels higher than normal after two years of lockdown, while over two million people in the UK have Covid. But this does not necessarily mean that a "tripledemic" is coming our way. Professor Amitava Banerjee, from the Institute of Health Informatics and UCL, told Express.co.uk: "In my view the word "tripledemic" is just the latest soundbite and we do not necessarily know that RSV will be as big a threat. "I think far greater potential threats to the NHS is due to chronic underfunding, chronic understaffing and the indirect and long-term effects of COVID."