Matthew Perrone Carlos Arrendondo arrives for his appointment to get vaccinated, as banners advertise the availability of the Johnson & Johnson and Pfizer COVID-19 vaccines at a county-run vaccination site at the Eugene A. Obregon Park in Los Angeles Thursday, July 22, 2021. The top health official in Los Angeles County on Thursday implored residents to get vaccinated as the region experiences a coronavirus surge similar to last summer's. (AP Photo/Damian Dovarganes) July 28, 2021 - 4:44 PM WASHINGTON (AP) â Federal health regulators on Wednesday again extended the expiration dates on Johnson & Johnson's COVID-19 vaccine, providing health workers with six more weeks to use millions of doses of the shot.