A new report from the United Nations says climate change is accelerating the rise of superbugs. So what exactly are superbugs? Viruses, strains of bacteria, parasites and fungi that are resistant to most antibiotics and medications aimed at treating the infections they cause are all considered superbugs. Superbugs were the cause of about 5 million deaths in 2019 and the number is expected to climb to 10 million by 2050.