Susceptibility to antimicrobial chemotherapeutic agents

[ben_dover808]

Of the following antibiotics, what is the best all around broad spectrum agent?What is the least effective broad spectrum agent?What was the most effective against Gram positive organisms?What was the most effective against Gram negative organisms? most resistant overall?

1.Penicilium

2.Streptomycin

3.Chloramphenicol

4.Tetracyclines

5.Bacitracin

6.Polymyxin