  We discuss the properties of hadronic fluctuations, i.e. fluctuations of net
quark and isospin numbers as well as electric charge, in the vicinity of the
QCD transition in isospin-symmetric matter at vanishing quark chemical
potential. We analyse second- and fourth-order cumulants of these fluctuations
and argue that the ratio of quartic and quadratic cumulants reflects the
relevant degrees of freedom that carry the quark number, isospin or charge,
respectively. In the hadronic phase we find that an enhancement of charge
fluctuations arises from contributions of doubly charged hadrons to the
thermodynamics. The rapid suppression of fluctuations seen in the
high-temperature phase suggests that in the QGP, net quark number and electric
charge are predominantly carried by quasi-particles, with the quantum numbers
of quarks.
