Del. Code tit. 14, § 2706

Any child affected with diphtheria, measles, scarlet fever or smallpox shall be excluded from the schools until permission of the proper school officer for the child to return is granted; and intercourse between pupils of the schools and the family or house, when there is any case of 1 of these contagious diseases, must be forbidden until the official permission is given to return to the school.