The Factors Responsible For Infectious Disease

1991 Words8 Pages
This essay will explore the factors responsible for infectious disease; what it is, how it is spread, and what measures can be taken to prevent it.
Microbes are single-cell organisms which are so small they can’t be seen with the unaided eye; but instead with a microscope. They are so minute that millions can fit onto the eye of a needle. Microbes date back billions of years and are the oldest form of life on this earth. They come in many forms: fungi, bacteria and viruses, and can live individually or clustered together. (American Society for Microbiology, 2014)
Fungi are thought to have come from the plant and animal kingdoms a billion years ago and were classified as plants for a very long time as both fungi and plants share similar lifestyles. They both grow in soil and are permanently attached to the ground, and they both have cell walls, whereas animal cells do not. On the contrary, although it is similar to a plant, it is not… it can’t make its own food via photosynthesis as it has no chlorophyll. Fungi get food by absorbing the nutrients from their surroundings. Fungi are eukaryotic cells (DNA exists within the nucleus) and exist in a wide variety of habitats: in the ocean, amongst rocks, deserts, and salty environments. Some forms of fungi (mushrooms) can be consumed, however some are deemed poisonous and can survive being exposed to intense UV and cosmic radiation. Fungi and bacteria are the two main decomposers of organic material on this Earth. (Nordqvist, What
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