First it was smallpox virus poison in a liquid form as milk, soda or ice cream. The virus does not cause an eruption of blisters but infects the gut and affect digestion and nutrient absorption. In particular vitamin Bs. Food intake for some individual doubles and there is noticeable weight gain. More importantly, prolonged deficiencies of vitamin sand essential minerals can lead to psychotic disorder.
...then comes the harassments and bullying to drive the person over the edge.
These tactics leads to murder, suicide and school campus shooting.
If you have a school lunch program, provide vitamins supplements, especially B12 and other B complexes. This alone can foil social disruptions that such insurgents are orchestrating.
Have a nice day.