Pneumonia Bacteria Building Resistance
Disease Control Center says germs that are among leading causes of pneumonia throughout world have developed resistance to main drugs usually used against them; problem has arisen with some strains of bacteria called pneumococci; if drug-resistant bacteria become widespread, they could develop into major health problem; bacteria presently appears limited to South Africa; Dr David Fraser comments; Natl Allergy and Infectious Diseases Inst is sponsoring program to develop vaccine against such bacteria (M)