S. enterica subspecies are further classified into more than 2000 serovars, which include pathogens having great medical and veterinary importance.
In the case of Salmonella serovars, which have a highly similar genetic background, the differences in host range suggest a variable number of pathogenic functions codified on the chromosome, although the size of the chromosomes among serovars is very similar.
Invasive Salmonella serovars, which cause enteric fever, can be commonly cultured from the blood of infected patients.
The species Salmonella enterica (S. enterica) includes many serovars that cause disease in avian and mammalian hosts.
Many serovars of S. enterica are intestinal pathogens of mammals and like E. coli they are exposed to lactose in the mammalian gut.
Many serovars of Salmonella enterica cause these infections, serovar Enteritidis being among the most common [ 2, 3].
Among the many serovars, Salmonella Typhimurium is frequently isolated from outbreaks as one of the common bacterial causative agents.
S. enterica subsp. enterica is considered the most widespread and includes many serovars, usually found in mammals, food and also in the environment [ 2].
This may indicate that many serovar Senftenberg clones enter the factories and may persist for a while, but probably not as long as serovar Agona and serovar Montevideo.
Salmonella serovar can have many strains, which allows for accelerated increase in the total number of antigenically variable bacteria.
