Received May 30, 2026
| Type | Name | Manufacturer | Dose | Lot | Route / Site |
|---|---|---|---|---|---|
| TDAP | TDAP (ADACEL) | SANOFI PASTEUR | N/A | U8797AA | IM / LA |
Male, age 12, received Adacel (Tdap) vaccine in the left deltoid at approximately 4:45 PM on 5/27/2026. Within approximately 17 hours of vaccination, he developed redness, swelling, and pain at the injection site. The initial area of redness and swelling was approximately 1 inch by 2 inches. A red linear streak extending approximately 4 inches toward the left axilla (armpit) was also noted. The area was painful but not itchy. Over the next several days, the redness progressively enlarged beyond the initially marked borders. Serial photographs were taken and borders were outlined with marker to document progression. By approximately 11:00 AM on 5/30/2026 (about 66 hours after vaccination), the area of redness measured approximately 4 inches in width and 5 inches in length surrounding the injection site. The red streak extending toward the left axilla remained present. Swelling at the injection site had decreased compared with earlier observations, but redness remained enlarged. Additional symptoms included significant pain at the injection site, and the shoulder with pain both at rest and with movement. The patient was able to raise the arm above his head, although movement was painful. There was also significant pain in the left axilla (armpit) with and without movement. No drainage or pus was observed. The affected area was not noticeably warmer than surrounding skin. Throughout the observation period, the patient remained afebrile, with a recorded temperature of 98.3°F approximately 29 hours after vaccination. No chills, lethargy, syncope, breathing difficulty, facial swelling, hives, or other systemic symptoms were reported. Treatment consisted of observation, serial photographs, border marking, and acetaminophen for pain relief. As of the time of this report, redness remained present and enlarged compared with the initial reaction, the red streak toward the axilla remained visible, injection-site swelling had improved, and axillary tenderness had slightly improved. The patient otherwise remained well with no fever or systemic symptoms. Outcome at time of report: not fully recovered; symptoms ongoing.
None.
Tightness of the right calf and achilles tendon.
None.
None.
None.