Masks are only a small part of it. The reality is that this is a big problem in general regarding superbugs that grow in hospitals. It's so much of an issue that many hospitals have found it more feasibly to demolish old wings and rebuild them in order to get rid of the resistant agents. From the article: "A growing swell of multi-drug-resistant organisms, known in the medical community as MDROs, has been worrying public health officials for years."