Staph infections are an infection caused by coccus bacteria called staphylococcus. These germs are found on the surface of the skin of the organism or in the nose of infected or even in healthy individuals.
Most of the time, these bacteria cause no harm or lead to minor skin infections that can be prevented by showering on a regularly basis and avoid sharing foods and things of infected peoples.
If you have vitamin B12 deficiency, you could become anemic. A mild deficiency may cause no symptoms. But if untreated, it may lead to symptoms such as: Weakness, tiredness, or lightheadedness