I would hardly say any of those plagues are anything near 'Biblical Proportions'. Even AIDS, whilst having the potential to be exactly that deadly, is slowly being managed and controlled. The biggest problem is in the more disadvantaged areas, such as Africa. Bird Flu is a storm in a ****ing teacup, sorry, but it's like SARS, all buildup no impact, more people die of bubonic plague each year, come to think of it, more people die of simple influenza or malnutrition each year than SARS and Bird Flu combined has ever claimed.
Skin diseases are usually spread by contact, cities are terrible places for spreading contact diseases. It's hardly surprising that a new strain would start out in one area and move outwards, I suspect treatment is pretty basic, it's not fatal, I'd hardly call it anything more than an interesting study of transmission.