Hi John
In my experience as a nurse, in an impending flu epidemic the elementary school children were the indicators when the flu hit any particular area. My guess would be since they have not had many viruses in their young lives, they are the first to experience the illnesses.
Before immunizations for the common childhood illnesses, i.e. measles, mumps, chicken pox, whooping cough, etc. were developed, absences for the first and second grades were common because children were home with the UCHD (usual child hood diseases).
Best Wishes, stay well, and good to 'see' you. : )
Wanda |