Final answer:
The nurse can expect the client with streptococcal pharyngitis to complain of pain due to sore throat caused by Streptococcus pyogenes.
Step-by-step explanation:
When assessing a client with streptococcal pharyngitis, the nurse can expect the client to complain of pain due to sore throat. Streptococcal pharyngitis, commonly known as strep throat, is caused by the bacterium Streptococcus pyogenes. This bacterium releases toxins that damage the mucosal membranes of the pharynx, resulting in intense pharyngeal pain and inflammation.