These yellow spheres are Streptococcus pyogenese bacteria bound to a human neutrophil – a key part of the immune system. Streptococcus pyogenese is the bacterium that causes strep throat in humans.

A severe sore throat may be an indication of possible strep throat, a bacterial infection. Individuals who develop strep throat often have high fevers or pus on the tonsils; however, Ongkasuwan said ...

Strep infections are most well known for causing strep throat, which can be treated with antibiotics. But this type of bacteria can also cause more serious illnesses—even flesh-eating infections ...