You may not have to do the experiment, see these two databases:
Gene Expression Omnibus (https://www.ncbi.nlm.nih.gov/geo/) and
ArrayExpress (https://www.ebi.ac.uk/arrayexpress/) are filled with gene expression datasets with macrophages stimulated with bacteria, fungi, LPS etcetera.
Dear Giuseppe, thanks you. I checked the databases but, i need to perform the experiment because the aim project is to analyze the expression of s. aureus under specific conditions.