TABLE 3.
Antiserum cross-reactions
| Antigen | Slide serology (dilution)a
|
Tube serology (dilution)b
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Undiluted | 1/2 | 1/4 | 1/8 | 1/16 | 1/100 | 1/200 | 1/400 | 1/800 | 1/1,600 | 1/3,200 | 1/6,400 | 1/12,800 | |
| S. dysenteriae serovar 1 | 2 | 1 | N | N | N | 3 | 1 | N | N | N | N | N | N |
| S. dysenteriae serovar 4 | 3 | 2 | N | N | N | 4 | 2 | 1 | N | N | N | N | N |
| S. dysenteriae serovar 16 | 3 | 2 | N | N | N | 4 | 2 | 1 | N | N | N | N | N |
| S. fexneri serovar 3 | 2 | N | N | N | N | 3 | 1 | N | N | N | N | N | N |
| E. coli O118 | Tr | N | N | N | N | 2 | N | N | N | N | N | N | N |
| E. coli O159 | 4 | 4 | 2 | N | N | 4 | 4 | 4 | 3 | 1 | N | N | N |
| E. coli O168 | 2 | N | N | N | N | 3 | 1 | N | N | N | N | N | N |
| E. coli O172 | 3 | 2 | N | N | N | 4 | 2 | 1 | N | N | N | N | N |
| E. coli O173 | 4 | 4 | 1 | N | N | 4 | 4 | 4 | 2 | Tr | N | N | N |
| Novel serovar | 4 | 4 | 4b | 4 | 3 | 4 | 4 | 4 | 4b | 4 | 3 | 2 | 1 |
a
Reactions were recorded on a scale of 1 to 4, with 1 being the lowest level of agglutination and 4 being the highest level of agglutination; Tr is indicative of a trace level of agglutination, and N is indicative of no agglutination.
b
Postabsorption with E. coli O159 and S. dysenteriae serovar 4 end titer with a level of agglutination of 4.