Figure 1

PFGE profiles of the Shigella sonnei biotype g isolates, 1971–1980. Lanes: 1, Salmonella Braenderup H9812 (molecular weight standard); 2–16, S. sonnei biotype g isolates: 2, Catanzaro, Calabria, 1979; 3, Palermo, Sicily, 1972; 4, Palermo 1975; 5, Palermo 1971; 6, Catanzaro 1979; 7, Palermo 1972; 8, Palermo 1973; 9, Catanzaro 1979; 10, Palermo 1972; 11, Cosenza, Calabria, 1979; 12, Palermo 1971; 13, Palermo 1973; 14, Catanzaro 1979; 15, Palermo 1971; 16, Palermo 1975.