What kind of a medicine can I use for protection...

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According to the general bacterial diseases which infected chickens for protection you should use
The following drugs 
OXYTETRACYCLNE-powder 50% bayer comapny or noorbrok company
Add in drinking water with dose therapy half gm/liter of drinking water
The water of drinking must be distal water
-You can use also  multivitamins liter INETRCHEM COMPANY-BAYER COMPANY
Add 1 ml/1 liter of drnking water daily for five days
These drugs give more ability and more  activity to improve  the immunity system of your chickens as soon as possible to have good production of meat and eggs
You can buy these drugs from vetrenarian pharmacy
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