Probable that you will be advised to keep DS off school and it is very infectious. Having said that my DS had it last year when we went on holiday with friends.. 5 children all in a house together, nobody caught it off him.
It needs flucloxacillin.. it's caused by the staph aureous germ.. my DS was put on it right away so maybe it made him less infectious to the others. It didn't chear up properly though until he was given fluxlox medicine AND cream.
SJ x