Figure 1: Inhibition of Staphylococcus growth by Ab3 in 15 daysold. Inhibition of the growth of S. aureus by Ab-3 purified by SpA-affinity chromatography (PURE-1A) were observed in pooled sera of chicks fed with anti-SpA hyper-immune eggs up to 15 days old. Inhibition were observed in dilutions of S. aureus treated suggesting that the Ab-3 was a mirror image of protein-A, binding to it on the cell wall of Staphylococcus aureus and inhibiting its growth, it does not occur in non-fed chicks and controls.