One good thing you can do for your immune system is put your phone down. No, I’m serious. Putting down your phone is one of the best things you can do for your immune system. 
Do you check Facebook and/or other media regularly? Are you experiencing anxiety and stress these days?
Cortisol levels in the body go up when we are emotionally stressed, which is the opposite of what we want for good health.
Not only is the extra cortisol coursing through you body not good but also the effect of the electromagnetics of the device on your body can weaken your immune system.
Limit the time you engage in media, whether that is the news or social media. Read that book, start a project, or even watch a funny movie on TV. There are so many healthier things you can do.