Welcome to the site! Jo is right in that keeping your hands etc clean is the best defense and you seemt o be doing that already. Wash your hands well before eating anything or touching any part of your face or preparing food etc and you should be fine. In fact soemwhere on here there's an entire post about bugs and avoiding catching etc. Anyhwo you've come to the right place. Everyone here is wonderful!
\"As soon as you trust yourself,you will know how to live.\"
Johann Wolfgang von Goethe
\"Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.\"
Benjamin Franklin