But if you only have a slight astigmatism -- your doctor may refer to it as a degree -- and you donât have another vision problem, you may not need them. Irregular astigmatism is far less common and is linked to problems with your cornea, the front part of the eye.
Malaria is one of the most infectious diseases in history. It has infected countless people across the globe and it still kills millions every year. The malaria parasite lives in the gut of the Anopheles mosquito and is transmitted through the bug's bite.
So, without further ado, here are the five most common infectious diseases. Hepatitis-B. According to current statistics, hepatitis-B is the most common infectious disease in the world, affecting some 2 billion people -- that's more than one-quarter of the world's population.uberculosis As I mentioned previously, estimating new and ongoing cases for some of these diseases can be downright difficult, and perhaps none more so than tuberculosis. TB is caused by a bacteria found in the lungs that can cause chest pain and a bad cough, as well as lead to a number of other nasty side-effects.