Unlike the ‘flu and COVID, there is no vaccine yet against RSV. There is a vaccine being trialled at the moment, being given to pregnant women and infants up to a year. When authorised in Australia, it may take twelve months before it’s generally available.
The only way to avoid any risk of infection is to minimise contact with infected people. If it is RSV, especially for very young, very elderly, or very sick people, it could end up with all sorts of complications requiring hospitalisation.