Based on this passage, the author would agree that ____.
Doctors in many countries have gone back to using old antibiotics that were abandoned… because their toxic side effects were so frequent and so bad. But superbugs, like Acinetobacter, have challenged doctors all over the world by now becoming resistant to these older and considered more dangerous medicines. Even colistin, an antibiotic discovered 60 years ago, has recently been used as a salvage remedy to treat patients with Acinetobacter infections. And it was successful for a while, but now it occasionally fails due to recent extensive use that has caused the bacteria to become resistant, leading to problem superbugs that are resistant to all available antibiotics.