Mayor Bill De Blasio announced last week that New York City-run vaccine sites no longer require an appointment for New York City residents age 50 and older; companions accompanying them who are also eligible may also receive the vaccine. PBS NewsHour Reports April 17: What Are My Chances of Hospitalization After Vaccination? Johnson & Johnson shots continue to be on pause as health officials investigate extremely rare side effects; Moderna and Pfizer vaccination appointments are becoming easier to snag in many states; and what scientists are learning about the vaccine’s efficacy against variants and ‘breakthrough infections.’ ProPublica reporter Caroline Chen joins Hari Sreenivasan to discuss.