It is not so easy to provide the answers requested. Roseola infantum is a herpes type viral infection, which is often difficult to diagnose with certainty. Infectiousness is probably highest at the onset of fever and resolves quickly after the rash appears and the fever disappears. As you can see, each case needs to be judged individually and the doctor who examines the child will be ib the best position to make a judgement. Scarlet fever is a bacterial infection and infectivity usually ceases shortly after appropriate antibiotic therapy is started. Conjunctivitis has a whole host of possible causes and the cause will determine the risk. Ringworm poses no risk ot other children and requires no isolation. Head lice requires no isolation if properly treated.
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