shigella flexneri antibody levels in healthy subjects from various regions of the united states. | | 1967 | 4862966 |
genetic properties of r factors associated with epidemic strains of shigella dysenteriae type i from central america and salmonella typhi from mexico. | | 1973 | 4577973 |
resistance of shigellae to ampicillin and other antibiotics. its clinical and epidemiological implications. | | 1972 | 4113693 |