If you are prescribed antibiotics, then it's important that you repopulate your gut with healthy bacteria. A good probiotic supplement can help and consuming fermented foods like kimchi, sauerkraut, miso, etc.
Following an anti-inflammatory should also help keep the immune system healthy: http://www.nutriliving.com/blog/top-10-anti-inflammatory-foods
Here are some good immunity boosting Blast recipes! http://www.nutriliving.com/recipes/search/keyword/immunity