The headline really should be "antibiotic overuse in fish leads to resistant bacteria" ... Not such an emphasis on fish are dangerous to humans.
From what I understand every human has some staph and pseudomonas active in or on their bodies. We get an infection from one when it gets out of hand.
For instance pseudomonas is associated with pneumonia, sinus infections, and ear infections. Not because the bacteria was gone and then arrived, but because something upset the balance of bacterias, yeasts, and whatnot living in happy harmony ... and the pseudomonas got out of control.
Staph too is ever present. MRSA is a different story but some types of staph are always there and you only get sick from it if you get all out of whack.
As we fish people know ... It's all about the beneficial bacteria!
Sent from my iPhone with three hands tied behind my back.