Influenza causes more hospitalizations among young children than any other vaccine-preventable disease. The single best way to protect against seasonal flu and its potential severe complications is for children to get a seasonal influenza vaccine each year (cited per the CDC). Flu vaccination is recommended for all children aged 6 months and older. Making healthy choices at school and at home can help prevent the flu and spreading flu to others.
Timing
The timing of flu can vary from season to season. In the United States, seasonal flu activity most commonly peaks in the U.S. between December and February, but flu viruses can cause illness from early October to late May.
Transmission
Flu viruses are thought to spread mainly from person to person through coughs and sneezes of infected people. Less often, a person might also get the flu by touching a surface or object that has flu virus on it and then touching their own mouth, eyes or possibly their nose.
Prevention
Everyday Prevention Measures from the CDC
For more info:
MDH Screening Tool - Is It Influenza?