88 Yo Female. She Has History Of Multiple UTI. Presented

88 yo female. She has history of multiple UTI. Presented with sudden onset of chills and shaking 1hr after eating. Resturant was normal temp , she had a light jacket. No fever. No sign of hypotention. Other vitals within normal range. Administered 325 MG Tylenol. Symptoms subsided after approx. 35 min. Sounds like early symptoms of UTI.
Your thoughts.