Email Invitation

Appendix A

Recruitment e-mail content For Group 1 & Introduction for Survey instrument #1

The same language will be used in the recruitment e-mail and in the survey introduction for Group 1.

Several Oasis of the Seas passengers who sailed on the Atlantis cruise from Miami, Fla., January 19–26, 2020, became sick with a drug-resistant strain of Shigella after the cruise. This highly contagious bacteria causes the diarrheal disease shigellosis. The U.S. Centers for Disease Control and Prevention is doing a survey to learn how ship passengers became infected. We are asking all passengers to take part in this survey, even if they did not get sick.

By taking part in this survey, you will help - us to learn how people became sick. This will help improve prevention efforts. Your participation is voluntary, and you may skip any question you do not want to answer.

The survey includes questions about activities you did while on the cruise. Some of these questions are sensitive in nature, but your answers will be kept confidential and private. The survey will take about 10 minutes to complete.

Recruitment e-mail content and Introduction for Survey Instrument # 2 (groups 2 & 3)

The same language will be used in the recruitment e-mail and in the survey introduction for Groups 2 & 3.

The U.S. Centers for Disease Control and Prevention is doing a survey to investigate several cases of drug-resistant shigellosis in the United States. Shigellosis is a diarrheal illness caused by the bacteria Shigella. You are invited to take part in this survey because you recently had an illness caused by drug-resistant Shigella.

By taking part in this survey, you will help - us to learn how people became sick. This will help improve prevention efforts. Your participation is voluntary, and you may skip any question you do not want to answer.

The survey includes questions about recent activities and symptoms of your illness. Some of these questions are sensitive in nature, but your answers will be kept confidential and private. The survey will take about 10 minutes to complete.