Bacteria | Community Health

Bacteria are single-celled, prokaryotic microorganisms that are ubiquitous in every habitat on Earth, from the freezing tundra to the hottest deserts, and play a vital role in the nutrient cycle, decomposition, and the sustenance of life. With over 100,000 known species, bacteria have been estimated to make up around 15% of all biomass on Earth, with a total of approximately 5 x 10^30 individual bacteria. They have been around for over 3.5 billion years, with fossil evidence showing that they were among the first life forms to appear on our planet. Bacteria are incredibly diverse, with species that can survive in extreme conditions, such as high temperatures, high pressures, and high salinity. They are also capable of forming symbiotic relationships with other organisms, including plants and animals, and are essential for many industrial processes, including the production of food, pharmaceuticals, and biofuels. According to the World Health Organization (WHO), bacteria are responsible for a significant proportion of infectious diseases, with around 17% of all deaths worldwide attributed to bacterial infections. The Centers for Disease Control and Prevention (CDC) estimates that in the United States alone, there are over 2 million cases of bacterial infections each year, resulting in over 20,000 deaths.