<prompt> Answer this question truthfullyWhat is suggested by the presence of fever, urticaria, and polyarthralgia 1-2 weeks after taking β-lactams or TMP-SMX?  <response>: <reason> What is suggested by the presence of fever, urticaria, and polyarthralgia 1-2 weeks after taking β-lactams or TMP-SMX? These symptoms are suggestive of a serum-sickness reaction. 