Between 1.1.1970 and 31.12.1973 3639 strains were typed with the aid of phage typing. Of these strains 1793 belonged to S. typhi and 1846 to S. parathyphi-B. 40 S. typhi phage types were found. 9 of these occurred in a frequency of more than 1% (relevant to foci). These were E1 (25.7%) (of this E1a 19.7%, E1b 5.9%), A (16.6%), F1 (7.5%), D1 (59%), C1 (5.4%) D2 (2.3%), 46 (2.1%), 28 (1.9%). Among S. paratyphi-B 24 phage types resp. varieties were found, 14 of these occurred in a frequency of more than 1% (relevant to foci). The phage types comprised Taunton (36.8%), 1 m.c. (10.3%), 3aI m.c. (7.5%), B.A.O.R. (6.8%), 3 a m.c. (4.9%), Dundee (4.6%), 3 aI var. 1 (4.6%), Beccles m.c. (2.4%), 3 b m.c. (2.3%), 3 aI var. (2%), 1 var. (1.8%), 3 aI var. 4 (1.1%). As far as it came to be known the epidemiological relations and particularities of the different S. typhi and S. paratyphi-B phage types are discussed. In th period of this report only one larger epidemic outbreak of S. paratyphi-B (type Taunton) occurred. Possibly the cause of this was contaminated milk.