From what I know if your
DS is exclusively breastfed and you have the relevant immunisations, then you pass on your immunity through your milk. I could be mistaken though so check it out for sure.
Other than that I'd take precautions such as long sleeved clothing at dawn and dusk because of mossies, be religious with sunscreen and hats, be careful of water getting swallowed during baths/showers to avoid upset bellies.
Hope you have a wonderful time.
Spring x