Protozoacides are substances specifically designed to kill protozoa, which are single-celled organisms that can cause diseases in humans, animals, and plants. These agents are often used in medical treatments to combat infections caused by protozoan parasites, such as those responsible for malaria and amoebic dysentery. In agriculture, protozoacides can help manage protozoan pests that affect crops and livestock. By targeting these harmful organisms, protozoacides play a crucial role in maintaining health and productivity in both human and agricultural contexts, contributing to overall disease control and food security.