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Table 1 Proto-AEs collected from Twitter data on influenza vaccine, HPV vaccine, Tdap vaccine, and Hepatitis B vaccine

From: Digital Drug Safety Surveillance: Monitoring Pharmaceutical Products in Twitter

Vaccine Influenza HPV Tdap Hepatitis B
Unique posts 398 30 10 4
Vaccine-event pairs 557 31 23 1
Key AEs Injection site pain; pain; malaise; purpura; urticaria Pain; injection site pain; urticaria Injection site pain; pain; malaise Pain; fatigue
  1. Proto-AE post with resemblance to adverse event, HPV human papillomavirus, Tdap tetanus/diphtheria/pertussis