There is provided a fusion construct of formula (I): X-A-linker-B-Z (I) wherein: (1) A and B are identical or different and are independently: (a) a polypeptide comprising a SACOL0029 polypeptide as set forth in any one of the sequences depicted in FIG. 24 (SEQ ID NOs: 5 and 121 to 131), a SACOL0264 polypeptide (SEQ ID NO: 185), a SACOL0442 polypeptide as set forth in any one of the sequences depicted in FIG. 22D (SEQ ID NOs: 29 and 82 to 92), a SACOL0718 polypeptide (SEQ ID NO: 186), a SACOL0720 polypeptide as set forth in any one of the sequences depicted in FIGS. 23I-J (SEQ ID NOs: 11 and 109 to 120), a SACOL1353 polypeptide (SEQ ID NO: 187), a SACOL1416 polypeptide (SEQ ID NO: 188), a SACOL1611 polypeptide (SEQ ID NO: 189), a SACOL1867 polypeptide as set forth in any one of the sequences depicted in FIG. 25D (SEQ ID NOs: 152 to 164), a SACOL1912 polypeptide (SEQ ID NO: 43), a SACOL1944 polypeptide (SEQ ID NO: 190), a SACOL2144 polypeptide (SEQ ID NO: 191), a SACOL2365 polypeptide (SEQ ID NO: 192), a SACOL2385 polypeptide (SEQ ID NO: 50) or a SACOL2599 polypeptide (SEQ ID NO: 193), based on the gene nomenclature from the Staphylococcus aureus COL (SACOL) genome set forth in NCBI Reference Sequence NC_002951.2; (b) a polypeptide encoded by a gene from a same operon as a gene encoding the polypeptide of (a); (c) a polypeptide comprising an immunogenic fragment of at least 13 consecutive amino acids of (a) or (b); (d) a polypeptide comprising an amino acid sequence at least 60% identical overall to the sequence of the polypeptide of any one of (a) to (c); or (e) a polypeptide comprising an immunogenic variant comprising at least 13 consecutive amino acids of any one of (a) to (c); (2) the linker is an amino acid sequence of at least one amino acid or is absent; (3) X is absent or is an amino acid sequence of at least one amino acid; and (4) Z is absent or is an amino acid sequence of at least one amino acid. Also provided are compositions and kits comprising the fusion and uses of these fusions, compositions and kits.