1.
the most frequent salmonella serotypes in human salmonellosis on the basis of data collected through EC monitoring systems;
2.
the route of infection (that is, the presence of the serotype in relevant animal populations and feed);
3.
whether any serotype shows a rapid and recent ability to spread and to cause disease in humans and animals;
4.
whether any serotypes show increased virulence, for instance as regards invasiveness, or resistance to relevant therapies for human infections.