Eagle effect is seen in: (A) Staphylococcus aureus, (B) Enterococcus faecalis, (C) Pseudomonas aeruginosa, (D) Streptococcus pyogenes
Answer is B. Some microbes demonstrate a curious response to b-lactam antibiotics known as Eagle-effect. Eagle-effect positive enterococci exhibit their greatest bactericidal response to penicillins at a concentration just above the MIC of the antibiotic, as concentration of P is increased above this value,bactericidal effect against enterococci is decreased. It is their unusual resistance to antibiotics - single outstanding characteristics.