Normal flora can be a barrier to entry in several ways. The living bacteria that lives in our bodies wants to stay living there. If another organisim comes along it is going to protect it's territory, so to speak. They have defensive mechanisims to prevent other bacterial intruders from gaining entry to the body.
there ara no microbial normal flora in the csf
Normal microbiota
Flora exists in various parts of the human body, in both men and women. Vaginal flora, or microbiome, in normal levels has no disadvantage. It helps the vagina stay "normal", clean and healthy.
heart
It is normally sterile--there is no flora unless it is introduced to the bladder. That's what causes a 'bladder infection'!
normal flora
Yes, usual flora, normal flora, and typical flora are all normal results.
there ara no microbial normal flora in the csf
You said that in your answer too. As the flora is normal, there is no harm
Normal flora cannot cause a "disease". But if normal flora is disrupted it can become a pathogen and then cause infection. Some diseases, like diabetes, can disrupt normal flora and cause infection, especially yeast infections on the skin or in the vagina of women.
normal flora
Get the Devon Scope.
Coral, Annenimes, and Seaweed
Normal microbiota
In general, your "normal" skin flora protect you from "rogue" flora which might do you harm.
how does residental normal flora protect the body against pathogens
barriers to entry are a set of agreements that prohibits a company from entering a certain market.