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Table 1 Agglutination titers with H4 antisera derived from strains U9-41 and P12b

From: Genetical and functional investigation of fliC genes encoding flagellar serotype H4 in wildtype strains of Escherichia coli and in a laboratory E. coli K-12 strain expressing flagellar antigen type H48

Strain reported serotype agglutination with antiseraa
   H4U9-41 H4P12b
U9-41 O2:K1:H4b 12800 12800
U1-41 O5:K4:H4b 25600 25600
P7d O68:H4b 1600 3200
E1541-68 O154:H4b 3200 1600
P12b O15:H17c,e 6400 12800
872-69 O20:H17d,e 12800 12800
107-74 O15:H17d,e 3200 3200
305-78 O15:H17d,e 3200 3200
870-69 O20:H17d,e 6400 12800
327-01 O77:H17d,e 12800 12800
  1. a) reciprocal value of agglutination titers with antisera (the same results were obtained in two separate experiments). H4U9-41 and H4P12b indicates the H4 antisera produced with strains U9-41 and P12b, respectively.
  2. b) E. coli standard test strain [3-5]
  3. c) E. coli standard test H-test strain [3-5], able to produce spontaneously a variant expressing flagellar antigen H4 and containing a fliC-H4 gene [21, 22]
  4. d) strains and serotype data provided from Flemming Scheutz, Statens Seruminstitut, Copenhagen, Denmark
  5. e) all H17 strains were shown to carry a fliC-H4 genotype and expressed flagellar H4 antigens (this work).