What do you suggest if my culture report shows the growth of staphylococcus aureus after 24 hrs aerobic incubation at 37'c.?

Bacterial infection. All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, you did not state what was cultured. If an abscess was cultured, it is compatible with bacterial abscess.