Text message template for recruitment of study participants
| Text message type | Text content |
| First (invitation) | [MOH] IC:01234567. You are invited to the next phase of the vaccine research study on dd/mm/yy at hh:mm - hh:mm. This will measure the status of your antibody level after vaccination. Please respond at bit.ly/abcdefg by Wednesday, 5:00 PM. Thank you. |
| Second (invitation reminder) | [MOH] IC:01234567. dd/mm/yy hh:mm - hh:mm. An antibody test is reserved for you next week. Please confirm your attendance at bit.ly/abcdefg by Wednesday, 05:00 PM. Thank you for your support. Please disregard this message if you have already responded. |
| Third (appointment reminder) | [MOH] IC:01234567. Reminder for your appointment tomorrow at Central Receiving Area (CSRA), RIPAS Hospital on dd/mm/yy at hh:mm - hh:mm. Location: bit.ly/tuvwxyz. |
bit.ly/abcdefg, custom link to online form; bit.ly/tuvwxyz, custom link for directions to blood sampling centre; dd/mm/yy, allocated date; hh:mm, allocated time; IC, Identity Card number; MOH, Ministry of Health.