AbstractIn response to a bacterial infection, insects launch an array of countermeasures. Among these are the antibacterial proteins, which effectively lyse bacteria or are bacteriostatic. These proteins were generally assumed to be restricted to insects, yet recent information has shown some homologous counterparts in verte brates, including humans. Recent data have revealed that at least some of these proteins can also act against eukaryotic cells, including human infectious Parasites The latter activities have opened up new possibilities for disease control.