This week, @Vaccines is curated by Dr. Kate O’Brien, Executive Director of the International Vaccine Access Center (IVAC) at Johns Hopkins Bloomberg School of Public Health. Dr. O’Brien is a physician, an epidemiologist and a vaccinologist with a focus in vaccine preventable childhood illnesses. Join the conversation on @Vaccines as Dr. O’Brien tweets from the Bill & Melinda Gates Foundation meeting on biomarker diagnosis, perspectives on immunization, and upcoming activities for World Pneumonia Day.

IVAC strives to accelerate equitable and sustainable access to vaccines through the generation, synthesis, and use of evidence to inform decision making and action. IVAC’s work focuses on disease epidemiology, vaccine economics and supply, monitoring and evaluation of vaccine introduction and center programs, and advocacy and communications activities to increase the profile of and global action on vaccine-preventable disease.