Final answer:
Organisms that colonize the skin are mostly gram-positive bacteria, but also include various eukaryotes and can be pathogenic or nonpathogenic. The skin microbiome consists of a complex collection of bacteria, fungi, and viruses, which play roles in skin health.
Step-by-step explanation:
Organisms that colonize skin are mostly gram-positive bacteria but can also include eukaryotic microorganisms such as fungi, namely yeasts and molds. These organisms are not always aerobes as there are also anaerobic bacteria present on the skin. The skin microbiome is diverse and includes both nonpathogenic and pathogenic species.
The skin microbiome is complex, hosting a variety of organisms that contribute to its health and ecosystem balance. Bacteria like Staphylococcus and Corynebacterium are gram-positive bacteria that form a significant portion of the skin's bacterial flora. While many are commensal or even beneficial, providing protection against pathogenic species, some can be opportunistic pathogens that cause infections, especially when the skin's microbial balance is disrupted.
Moreover, recent research suggests that in addition to bacteria and fungi, viruses also contribute to normal skin flora. The presence of Papillomaviridae, Polyomaviridae, and Circoviridae families has been identified on the skin. Despite this, some skin-associated viruses can be pathogenic and cause a variety of diseases.