There are many antibiotics, but there has been a rapid increase in bacteria evolving to become resistant to what little defense we have against them. These bacteria have had a massive head start to develop resistance, so finding new antibiotics may be a major challenge.
Have you learned a word or concept or seen an item and then suddenly see it everywhere? You’re left with a sense of confusion as to why that thing is so much more common now. That concept right there is the Baader-Meinhof phenomenon. Like deja vu where you’ve seen something before but don’t know from what, the Baader-Meinhof phenomenon also experiences that but focuses more on how much more frequently you see that recurring thing.