Cephem compound and pharmaceutical composition containing the compound

A pharmaceutical composition for the treatment of infectious diseases associated with merleillin-resist Staphylococcus aureus which comprises a cephera compound of the formula ##STR53## wherein Q represents CH;

• R.sup.1 represents a carboxylate group or a carboxyl group;
• and
• R represents the group ##STR54## wherein R.sup.2 represents a loweralkyl group, a loweralkenyl group, a loweralkynyl group, a hydroxylloweralkyl group or the group --A--CO---R.sup.3, wherein A represents a C.sub.1-6 alkylene group;
• R.sup.3 represents a hydroxyl group, a loweralkyl group, an amino group, or a loweralkylamino group;
• B.sup.- represents an anion;
• and f is equal to 0 when R.sup.1 represents a carboxylate groups and 1 when R.sup.1 represents a carboxyl group;
• or a cephemcarboxy-protective ester thereof or a nontoxic salt thereof;
• and a pharmaceutically acceptable carrier.