The data indicated that none of the shrimp isolates presented a
strong ability to form biofilm on abiotic surfaces, but two E. faecalis
strains isolated from RTE shrimps showed a moderate ability to
produce biofilm. A weak ability to produce biofilm was shown by 13
isolates, on which 6 strains were isolated from RTE shrimps (three
E. faecalis and three E. faecium), four from raw shrimps (three E.
faecalis and one E. faecium) and three from cooked shrimps (two E.
faecalis and one E. faecium).
The experiments also indicated that there was no association
between the presence of esp and gelE and the ability to form bio-
film. It was noted that although all isolates were esp-positive, only
15 were biofilm producers while from 31 gelE-positive strains, 14
were biofilm-positive. One gelE-negative strain had the ability to
produce biofilm.