re young bird sickness i have found that when you notice birds vomiting over night to treat affected birds by giving a prazole tablet and clear all food from crop and do not feed affected bird(s) for 24 hours. Then feed a small quantity of light mix till birds droppings return to normal usually 2_3 days. when birds contract y b sickness you must inspect loft be fore daylight to look for vomitted feed or birds will eat same and you will be unaware you have a problem till your birds have crop poisoning I also agree that it does not matter if birds eat vommited feed and drink same water as it helps to get the problem to run its normal cause through your birds till they build up immunity.I only isolate the birds that are spewing .when you know you have yb sickness look for birds that stop feeding before the rest this will enable you to to treat as above and will usually clear within 2 days .
