State and federal data show high levels of respiratory illnesses. Here's what to know about the illnesses circulating this winter, their symptoms and how to prevent them.

As of Dec. 28, Michigan’s flu shot uptake -- less than 2.5 million doses -- sat far below its goal of 4 million doses administered. The state is behind where it was this time each of the last five years.

Influenza A, COVID-19 and norovirus (stomach flu) are on the rise, according to the Centers for Disease Control and Prevention. But there's a fourth "bug" the public should be aware of: respiratory syncytial virus. RSV causes cold-like symptoms and affects the breathing passages and lungs.

Hospital bosses have urged patients, staff and visitors to wear surgical face masks to combat a surge in flu cases. A spokesperson for Southmead Hospital in north Bristol said they have seen a "sharp rise" in flu and respiratory illness – particularly since the start of the year.

Leighton Hospital has "strongly urged" patients and visitors to wear face masks in clinical areas amid a rise in cases of seasonal viruses - including flu, norovirus, RSV and Covid. The reintroduction of face masks in these areas comes into force today (January 9).