Badahdah A, Bakarman MA, Khatami A, Tashani M, Barasheed O, Alfelali M, Azeem MI, Bokhary H, Soltan O, Lahra MM, Jeoffreys N, Kok J, Dwyer DE, Booy R, Rashid H and the Hajj Research Team Abstract Hajj and mass gatherings Meningococcal disease Pneumococcal disease 2020 Journal of Travel Medicine. 2020;27:taaa032. https://doi.org/10.1093/jtm/taaa032