Many people have asked us about foods that have antibiotic properties. 
Here are some suggestions:
Garlic
Allicin is one of the active ingredients of freshly crushed garlic and this has a variety of antimicrobial activities. It is an antibacterial as well as antifungal, antiparasitic and antiviral. Many cultures use a mixture of garlic juice and water as an antiseptic lotion for wounds.
Honey
Not just Manuka honey but any unpasteurised honey has therapeutic properties. It is gaining acceptance as an antibacterial agent for the treatment of ulcers and bedsores and other surface infections from burns and wounds. Honey is used on infections not responding to standard antibiotic and antiseptic therapy. Honey has also been found to be effective in treating bacterial gastroenteritis in infants. A teaspoon of honey before sleep can help alleviate the cough of an upper respiratory tract infection. Read more in this article by Peter Molan.
Turmeric
Antibiotic, antiseptic, disinfectant and painkiller elements are all found in turmeric.
Aloe Vera
The useful part of aloe is the gel. It is obtained from the cells in the centre of the leaf but not from the cells beneath the green skin.
The gel has properties that are harmful to certain types of bacteria and fungi. It also seems to be able to speed wound healing by improving blood circulation through the area and preventing cell death around a wound.