Re: Which type(s) of bacteria are most commonly found on the human hand.

Dear Katy,

I hope the following information answers your question.

The majority of skin microorganisms are found in the most superficial layers of the epidermis and the upper parts of the hair follicles. They consist largely of micrococci (Staphylococcus epidermidis and Micrococcus spp.) and corynebacteria. These are generally nonpathogenic and considered to be commensal, although mutualistic (beneficial) and parasitic (harmful) roles have been assigned to them. For example, skin bacteria or their metabolites may protect against colonization by dermatophytic fungi and/or bacterial metabolites on the skin may contribute to the development of certain skin cancers. Sometimes potentially pathogenic Staphylococcus aureus is found on the face and hands, particularly in individuals who are nasal carriers of this organism. Qualitatively, the bacteria on the skin near any body orifice may be similar to those in the orifice.

Propionibacterium species and Peptostreptococcus species are two anaerobes that can also be found on the skin.

For more information on normal skin flora go to the website: http://www.bact.wisc.edu/bact330/330lecturetopics

Sincerely,

    June Wingert  RM(ASM)
    Baylor College of Medicine
    Center for Comparative Medcine
    One Baylor Plaza
    Houston, Texas   77030
    jwingert@bcm.tmc.edu
    beachcomber@pdq.net