Introduction:
In response to the heightened human immunodeficiency virus (HIV)/acquired immune deficiency syndrome (AIDS) epidemic in Samut Sakhon, Thailand, this study aimed to propose a communication model to raise awareness among migrant workers and examined its effect on the participants’ knowledge, self-efficacy to take preventative measures, perceived susceptibility to HIV/AIDS, perceived severity of HIV/AIDS to their health, perceived benefits and barriers to taking preventive measures against HIV/AIDS, and self-reported behavioral changes.

Material and methods:
A participatory risk communication campaign was designed based on the input from two focus groups consisting of 16 respondents in a factory and in-depth interviews with 10 local government and non-government officers responsible for HIV/AIDS prevention and control. With the cooperation of factory health volunteers recruited from the workers in the target factory, the intervention was developed and administered to 400 workers for two weeks starting on International Condom Day in 2017. The intervention components included events and activities, workshops and training, a media campaign, and quantitative and qualitative evaluations.

Results:
The effects of the campaign on knowledge scores, stages of change in condom use and HIV testing, self-efficacy, and the perceived benefits and barriers to taking preventative measures against HIV/AIDS were found to be significant, but the effect of the media campaign on the perceived risk of contracting HIV was not significant (alpha 0.05).

Conclusions:
The study found that the participation of the migrants contributed to the campaign’s success in creating impacts on HIV/AIDS prevention and awareness among migrant workers in Samut Sakhon, Thailand. Significant increases in self-efficacy, knowledge, and condom use were reported by Myanmar workers following the media campaign.