“…As has often been pointed out, notably from Philadelphia by Austrian (Austrian & Gold, 1964; Austrian, 1968Austrian, , 1975Austrian, , 1977a and b), serious infections due to this species are still common and, particularly among some groups of patients, still have a high mortality rate. The recent emergence of pneumococcal strains resistant to penicillin and to other antibiotics (Hansman et al 1971;Appelbaum et al 1977) has emphasized the importance of a preventive rather than a purely therapeutic approach to pneumococcal infections. Since the * Present address: Public Health Laboratory, Northern General Hospital, Sheffield S5 7AU.…”