Antibiotic-resistant bacteria with the potential to cause untreatable infections pose "a catastrophic threat" to the population, the chief medical officer for Britain warns in a report calling for urgent action worldwide.

Also: "The problem of microbes becoming increasingly resistant to the most powerful drugs should be ranked alongside terrorism and climate change on the list of critical risks." One root of the problem: doctors over-prescribing, and scared patients over-demanding, antibiotics for every little thing.

Meanwhile, the CDC is warning that a new SARS-like virus has popped up in the Middle East.