This week Bill and Melinda Gates released their annual letter, including a showcase for the “miracle” vaccines they have championed to save children’s lives around the world for some time.

Concerns about the anti-vaccination movement in the US flared, while opinion leaders examined the valuable return on investment produced by global health interventions like vaccines. Conversations around the threat of polio and its tragic history continued, using photos like the one above as a graphic reminder.

Researchers discussed their latest results in the journey to produce a more effective malaria vaccine, and academics from LSHTM in the UK considered possible routes to vaccines that better prevent killer pneumococcal disease, which can cause pneumonia, meningitis and septicaemia.

The yellow fever outbreak that ravaged DRC and Angola last year was declared officially over, and Liberian politicians looked back once again on lessons learned from Ebola.