What are two common pathogens causing unilateral lymphadenitis in children?

Unilateral lymphadenitis in children is often caused by specific bacterial infections, and the pathogens most commonly associated with this condition are Group A Streptococcus and Staphylococcus aureus. Group A Streptococcus, also known as Streptococcus pyogenes, is frequently responsible for skin and soft tissue infections. It can lead to lymphadenitis, especially when there is an associated wound or infection in the area that spreads to local lymph nodes.

Staphylococcus aureus, another common pathogen, is known for causing various infections, including skin infections like abscesses, which can also result in lymphatic involvement. The combination of these two pathogens represents a typical clinical presentation for unilateral lymphadenitis in pediatric patients.

The other choices include pathogens that are less commonly associated with unilateral lymphadenitis in children, often seen in different contexts or infections. For instance, Escherichia coli and Neisseria meningitidis are not typically linked to isolated cases of lymphadenitis in the pediatric population. Similarly, while Haemophilus influenzae and Group B Streptococcus can cause infections in children, they are more intimately tied to other conditions or scenarios rather than unilateral lymphadenitis. This highlights why Group A Streptococcus and Staphyl