Which one thing is not true about antibiotics?

1. The term “antibiotic” was coined by Selman Waksman in 1942
2. First antibiotic was discovered by Alexander Flemming
3. Each antibiotic is effective only against one particular kind of germ
4. Some persons can be allergic to a particular antibiotic

'Each antibiotic is effective only against one particular kind of germ' is not correct.