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Bacteria are very tiny organisms, that are typically present in almost every habitat on the planet. Even though they measure just a few micrometers, they prove life-threatening when they infect the respiratory system and deteriorate digestive health. They are ubiquitous to soil, radioactive waste, water, biomass and even organic matter. Bacteria inhabit the bodies of life forms, like plants and animals. They are much more in number than the human cells in the human body, and thrive on the skin and within the digestive ulact. Bacteria play a very vital role in recycling nuulients. While a majority of bacteria in the human body are countered by the immune system, there are a few that are pathogenic in nature.
Pathogenic bacteria cause infectious diseases like leprosy, cholera, anthrax, and bubonic plague. They are also responsible for the spread of respiratory infections like tuberculosis. The bacterium legionella causes Legionnaires' disease, a lung infection which is a severe form of pneumonia. The disease spreads by inhaling the bacteria or through contact with a person suffering from the disease. Legionella also cause a flu-like illness called Pontiac fever. Yaws disease is a relatively lesser known disease caused by the bacteria Treponema pertenue. It affects the skin, bones, and cartilage, and spreads through skin contact. Lack of cleanliness and hygiene is the main reason behind this illness. Mostly, children contract the Yaws disease and it commonly occurs in poor communities inhabiting regions that have a tropical, humid climate.