An apple a day may keep the doctor away, but the worst diseases in human history can’t be tamed so easily. Viruses, bacteria, fungi, parasites, and other malicious entities are the epitome of natural selection and they’re constantly evolving to attack hosts in new ways.
During our long stint on earth, mankind has faced a number of formidable diseases. Though modern medicine has found a way to treat or prevent many deadly illnesses, diseases are always one step ahead. While we’re better off today than at any point in history, there are still some terrifying diseases in existence!
Whether you look at ancient history or the recent past, you can spot sicknesses that make your skin crawl just thinking about them. Let’s take a look at 31 of the worst diseases humans have ever encountered.