Which of the following bacteria is NOT typically found at an infected implant site?

Staphylococcus aureus is typically recognized as a key pathogen associated with skin and soft tissue infections, including those that can occur at the site of surgical implants. Its virulence factors enable it to adhere to surfaces and evade the host's immune response, making it a common inhabitant in infections related to implants.

In contrast, the other bacteria listed have different associations. Streptococcus mutans is often implicated in dental caries and oral biofilm formation, which can contribute to peri-implant diseases. Anaerobic rods are commonly found in periodontal infections and may also play a role in implant-associated infections, especially in environments where oxygen is limited. Streptococcus sanguis, like Strep mutans, is related to oral health and can be present in biofilms associated with implants.

While Staphylococcus aureus can be found in some infections, the other bacteria listed are more commonly associated with the specific types of infections occurring at an implant site, particularly as part of the complex microbial communities that develop in periodontal and peri-implant conditions. Therefore, identifying Staphylococcus aureus as not typically being associated with an infected implant site aligns with the understanding of the bacterial profiles involved in those infections.