It's important to remember that publishing on the web is very easy - almost anyone can do it! The problem with that is knowing what's credible (worth your time) and what's not.
There are five main criteria that I use when evaluating a website:
Some of the things you want to look at or for in a website include:
Ultimately the researcher must be the one to determine whether or not to use information found on a website. Below are a couple of links to websites that provide some excellent guidelines for evaluating resources and websites:
Microbiology Organizations (Worldwide)
Antibiotic Resistance Organizations
Microbiology Institutes
Virology Societies