perkins. and then explore the newly located near the u.s. capitol and set for a september 17. and then watch the 1960 presidential debate between john f. and richard nixon. watch american history tv this weekend on c-span3. ♪ "washington journal" continues. dr.: we are joined by william moss, a professor at johns hopkins bloomberg school of public health international vaccines center. thank you for joining us. guest: thank you for having me. host: a little bit about your work at the vaccine access center, talk about that and in the international aspect. guest: yes, so the international vaccine access center, we celebrated our 10th anniversary just last year. and our main focus has been to increase access to life-saving vaccines throughout the world. traditionally, we have focused on childhood vaccines, particularly making sure that there is access in africa and asia, and that the vaccines are reaching the most vulnerable children, but then we have been very involved in thinking about covid-19 vaccines, particularly how such a vaccine might be distributed, how we will ensure its safety and efficacy, and how we will get equitable distrib