I got four chicks, one which died last week after obvious stunted growth and lethargy. My remaining chicks are 2 1/2 weeks old, one of which shows obvious stunted growth and lethargy. Droppings appear to be normal, but do include some chalky white substance. Appetite is fine. Should I be concerned about Salmonella Pollorum? I got my birds from a small farmer when they were a few days old, environment appeared clean and dry and birds all appeared healthy until a few days later. Is there a site with photos of what chicks with this illness would look like, poo would look like? Thanks!