Question

Please choose a different part of your body and discuss common resident Gram-negative bacteria that may be found in that location. What are their specific roles? 150-250 words

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Answer 1

Answer:

Normal flora is the term used to refer the mixture of organisms that can be found regularly at any of the anotomical site in humans. Although the majority of these normal flora are bacteria,there are few eukaryotic fungi and protists too that can be found in human body.

Let us take the human gastrointestinal tract (GI Tract) as an example of normal flora site in humans.

• Lactobacillus is a Gram-positive,rod shaped,facultative anaerobic bacteria found in human GI tract.
• They forms the majority of the lactic acid bacteria group that converts sugar into lactic acid.
• They shows a mutualistic relationship with human by protecting the host against pathogens and in return derives the required source of nutrients from the host.
• They help human guts from contracting infections from the fungal pathogen-Candida albicans that too are found in human guts,by producing hydrogen peroxide,a growth and virulence inhibitor of these pathogens.
• Lactobacillus together with other probiotic organisms that are found in milk,yoghurt etc,increases the immunity of mucous intestines by raising the number of immunoglobulin A antibodies.
• In children, these bacteria helps in reducing the chances of dermatitis by secreting an anti-inflammatory proteins called cytokines.
• In total, these bacteria plays an important role in the human digestive health by influencing the immune system and protecting the GI from various other pathogens and virulences.

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