The happening of an infectious disease at a child can justify a temporary ousting of the group for two types of reasons: risks of contagion for other children, and risk incurred by the child due to illness. In reality, this second situation is relatively rare there...

Three stages are necessary for transmission from an individual to other one of infectious disease: The pathogenic agent must be excreted by ill subject or by healthy bearer (in order of frequency: nose, mouth, saddles, skin, urine); He must be transferred to the healthy person (in order of frequency:...