Which bacteria are commonly responsible for causing impetigo?

Impetigo is a highly contagious skin infection that primarily affects children and is characterized by the formation of crusty sores. The two bacteria most commonly responsible for causing impetigo are Streptococcus pyogenes and Staphylococcus aureus.

Streptococcus pyogenes, also known as Group A strep, is well-known as a causative agent of skin infections, including impetigo. It can penetrate through breaks in the skin and lead to the typical honey-colored crusted lesions seen in this condition.

Staphylococcus aureus is another significant contributor to impetigo. This bacterium can also cause skin infections, and its association with impetigo is particularly due to its ability to produce toxins that can lead to the formation of blisters and subsequent crusting.

While E. coli, Salmonella, and HPV are associated with other types of infections, they do not play a recognized role in the etiology of impetigo. Therefore, the combination of Streptococcus and Staphylococcus aureus identifies the correct causative agents of this infectious skin condition.