How to make my nearly 2 years old to avoid swine flu?

Ugh! I just found out yesterday that there 2 swine flu kids by me and now I am pretty much worry about it. I have nearly 2 years old and 2 months and half old, I am so scary and don't want my both boys to get it because it's seem go worst now, every where had swine flu. However My nearly 2 years old he started picking foods and drinks from last week to now, I also try put him flintstones vitamins but he won't take it even I try all different kind of vitamins but he still won't take it which I am pretty much worry that he won't have enough vitamins, most people told me that he will need vitamins to keep his immunity support but he won't take those gummies even I try another flintstones so I can crunch it and I already put them in the foods to hide so that he won't know but he knew and won't take it! It's driving me crazy when he's picking foods cause he usually he eat everything! and won't take those vitamins now I don't know what to do, I also have been trying to put him special kids vitamins drink but he still won't take that either. Please help me I don't want my nearly 2 years old to have weak immunity while there swine flu around and of course he always get bath every time I get home from some where else. I would be glad if you will help me thanks!