The species found in mainland France, mainly along the Mediterranean coast are not very venomous, but their bites can be aggravated by the presence of soiled food products (and thus bacteria) rotting in their teeth. For this reason, it is important to disinfect the wound fully, in order to avoid the risk of microbial infection and septicaemia. The bites can lead to some anxiety and shivering, which dissipates on its own. Analgesics can sometimes be necessary, as recommended by medical workers. See a physician if symptoms persist, especially if you were bitten by a tropical species.