What is the fine-grained topic of the following text: "MRSA and other antibiotic-resistant 'superbugs' represent one of the greatest public health challenges of our century, and identifying those dangerous bacteria early is crucial in both treating patients and limiting the spread of the infection to others," says Don Mooney, president and CEO of MicroPhage. Only return the topic.
Antibiotic-resistant 'superbugs' and their public health implications