Just a couple of ideas that might help as reduce infection or fight it off. Please add others that you think may help.
1) Get your sleep and food
My family lives on the other side of the world. About half the times I visit them (24 hours travel + jetlag) I have ended up quite sick with a virus or bacteria a day or two after I arrive. I can't emphasise enough how important good rest and nutrition are if you are going to fight off a virus. If you are not eating well, fix that. If you aren't sleeping, do everything you can to fix that. Try to minimise stress, though that is harder than getting a good night's sleep. The more people you have to care for, the more important self care is.
2) In public spaces, put a glove on one hand. This tip is from the NY Times. I have found it's nearly impossible not to touch my face. I do it without thinking, and even if I know I am about to do it, it's really hard to stop myself. So this is a simple trick. Put a glove on one hand, and only touch unreliable surfaces with that hand. If you need to scratch your nose, the other hand is safe. Wash the glove when you get home each night. Take it off at the wrist, so you don't touch it with your "safe" hand unless you can wash your hands immediately.