Disclaimer:  this post in no way is stating that someone will not get a virus, these are tips on things you can eat that can help you to be your healthiest:

To start, try having some of these foods more often:  garlic, brussels sprouts, broccoli, cauliflower, kale, spinach.  These foods contain many vitamins and antioxidants to help you body to perform its best. Some even have possible anti cancer properties.   Also, foods rich in vitamin C such as oranges, clementines, strawberries, raspberries, bell peppers may help ward off sickness.  

In addition, adding Greek or regular yogurt to your food repertoire gives you probiotics- the yogurt helps to add good bacteria to your gut to help get rid of the bad bacteria.  

If you are vegetarian/vegan make sure to take vitamin B12 and a multivitamin

Make  sure to engage in some joyful movement- rather than calling it exercise, find something that allows you to move, and is something you like, as long as you are medically approved to exercise. 

These are just a few things you can start to do for your health!!!