In classical sculpture, Hygeia often holds a large snake (the symbol of medicine--Aesculapius, the god of Medicine, was Hygeia's father). Her other symbol is a water basin. The cult of Hygeia started in around 600 BCE and became 'hot' around 400 BCE because of the spread of plague. By 100 CE temples to Hygeia were established in Rome.
Hygeia also occurs with a bocage, but as such it is extremely rare. If you want this, good luck trying to find it, especially with original bocage intact.