  The precision reached by recent lattice QCD results allows for the first time
to investigate whether the measured hadronic spectrum is missing some
additional strange states, which are predicted by the Quark Model but have not
yet been detected. This can be done by comparing some sensitive thermodynamic
observables from lattice QCD to the predictions of the Hadron Resonance Gas
model (with the inclusion of decays [3]). We propose a set of specific
observables, defined as linear combinations of conserved charge fluctuations,
which allow to investigate this issue for baryons containing one or more
strange quarks separately. Applications of these observables to isolate the
multiplicity fluctuations of kaons from lattice QCD, and their comparison with
the experimental results, are also discussed.
