Patient Portal Flu Vaccine Reminders_RCT 5 (LADHS)

"Enhanced texts - Callback by a person: Patient randomized to this study arm will receive a phone call back by a call center agent if they press 1 in response to a question on the original text message. The call center agent's job is to schedule patients for clinical visits. These call center agents will be trained by our faculty and staff and will have the usual HIPAA and other patient confidentiality training."

"Patients randomized to this study arm will receive a text message from a call center agent if they press 1 in response to a question on the original text message. The bidirectional texts will have an agent who can answer questions and schedule an appointment through text message back-and-forth conversations with the patient."