INCUBATION PERIODS
The incubation period of scarlet fever is from one to seven days.
Measles, ten to twenty days.
Whooping cough, from one to two weeks.
Chicken-pox, fourteen to sixteen days.
German measles, seven to twenty-one days.
Diphtheria, any time from one to twelve days.
Mumps, from one week to three weeks.
Of all the diseases, measles and chicken-pox are probably the most contagious. In scarlet fever and diphtheria, close contact is necessary for exposure, while whooping cough can actually be contracted in the open air, young babies being particularly susceptible.