Materials and Methods: This was a quasi-experimental study. The population under study were 200 pregnant women who visited the health centers of Sirjan. These people were randomly divided into intervention (n = 100) and control (n = 100) groups. The educational intervention was conducted over two 60-minute sessions. Information was collected through a questionnaire (71 questions) before the intervention and three months after it. Chi-square test, Fisher exact test, independent t test, paired t test and Pearson correlation coefficient were calculated.

Results: After the intervention, the knowledge score increased in both groups; this was probably due to the routine training programs at those centers, but significant increases in attitude and practice were only observed in the intervention group (P < 0.05). Furthermore, perceived susceptibility, perceived severity, perceived benefits, cues to action and efficacy increased significantly and perceived barriers decreased significantly in the intervention group.

Conclusions: HBM was effective in promoting the KAP of pregnant women in Sirjan for preventing type A influenza. Therefore, HBM can be used to help prevent influenza A in the pregnant women.