Lyme Disease in Canada

Seven pathogens had at least one newly authorized vaccine since 2015: three of 13 high-priority (influenza, n=4; Streptococcus pneumoniae, n=2; respiratory syncytial virus, n=3); two of eight medium-priority (herpes zoster, n=1; meningococcal serogroup B, n=1); and, two of nine low-priority pathogens (dengue, n=2; human papillomavirus, n=1). Nineteen pathogens had no authorized vaccine in Canada or elsewhere, although five had candidates in phase 3 trials (Clostridioides difficile, Neisseria gonorrhoeae, Borrelia burgdorferi, norovirus and cytomegalovirus).