The various types of microorganisms are pathogenic microbes, organisms and parasites. These organisms cause different medical problems from mellow skin irritations to pneumonia and tuberculosis. Microbes are 10 to multiple times bigger than viruses. Organisms are different as far as their shape, size and methods for tainting people. Parasites are a piece of an enormous gathering of life forms called eukaryotes. Parasites are not quite the same as microbes or viruses.