Eight buffalo herds in the Naples area have been quarantined on the suspicion that their milk could be contaminated. The animals have been grazing on land where toxic industrial waste has been dumped illegally by criminals. The milk produced by the buffalo herds is now being tested for dangerous levels of dioxin. Although only a fraction of the herds in the region have been affected sales of Neapolitan mozzarella have declined by nearly 50% following the scare. The Government says consumers would need to eat large quantities of mozzarella over a period of several months for their health to be affected.