No vitamin can prevent conjunctivitis. It's an infection/inflammation. Not tissue breakdown.
Educating both students and parents in handwashing, refraining from rubbing the eyes, more handwashing, using disposable tissue to cough and sneeze into and handwashing would make a good prevention plan.
Educating parents and teachers in the common symptoms of conjunctivitis (how to recognize it) and how it's transmitted would be invaluable. Teaching everyone that there are different types of conjunctivitis and not every type is contagious, caused by bacteria or requires antibiotic treatment would also be nice. Treatment and contact precautions should be taught.
A special assembly with a public health nurse - maybe the school nurse as speaker, as many have an MPH - would take care of students. A second one in the evening for parents and teachers. For both, a computer slide show to view a a case of conjunctivitis and Q & A session afterward. And written info sent home with kids/parents. The CDC or local health dept. can provide this. The cost would be nominal.
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