The chances of catching up with the flu are lower if you maintain a healthy lifestyle. It means not only healthy nutrition but also physical activity. In addition, take vitamins and supplements (vitamin D, vitamin C, zinc, etc) to support the immune system. All these vitamins you can buy even online, personally I buy all the meds from Canada Drugs Direct.
You should wash your hands thoroughly and use protective gear. I recommend that you have a look at Dickies medical clothing also. Maybe you will find it helpful to you too, good luck with it