Babies on oxygen and feeding tubes are flooding hospitals as RSV -- a potentially deadly respiratory virus -- runs rampant across the country. Wellington hospital has more than 20 babies in its children's ward, many on oxygen. And there is a warning the flu-like RSV is yet to peak, as a sudden spike that's hit every part of the country. Māni Dunlop speaks to respiratory paediatrician and president of the Association of Salaried Medical Specialists Dr Julian Vyas about what RSV is and what parents need to be on the lookout for.