Bird liver need guidance

Last 60 days mortality range 7 to 9 birds we run ciprofloxcin doctor visit and told it's ecoli we run ecolI medicine than he tells it's adeno virus than a lot of experiments are done by doctor but no cure only mortality decrease to average in 6500 birds any advice new to poultry industry

Now it's 7 birds today again started ciprofloxcin grand pharma company