How fatal are gram-negative bacteria?

Gram-negative bacteria:

1. Gram-negative bacteria contain a thin peptidoglycan layer and consist only of a cell wall.
2. They contain a unique outer membrane made up of lipopolysaccharides and contains porins.
3. Examples of gram-negative bacteria include Escherichia coli, Pseudomonas, Helicobacter, and Salmonella.
4. These bacteria pose a serious threat to public health as they are highly resistant to antibiotics.
5. They are responsible for several serious illnesses that are hard to treat such as pneumonia, meningitis, and gonorrhea.