Received: 5 October 2018
Accepted: 24 June 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: At the time of enrolment in FiPP, consent was given to use swabs for future ethically-approved research. Ethics approval for the work described in this publication was given by Health Sciences Human Ethics Sub-Committee at The University of Melbourne, Australia (Ethics ID #1543881).
: Not applicable
: CS, EMD, CDN and EKM are investigators on a clinical research collaboration with Pfizer investigating the impact of PCV on adult pneumonia in Mongolia. MH received consultancy fees and has been awarded investigator initiated research grants from Pfizer, not related to this work. The other authors declare that they have no competing interests.