Flock lockdown has been practised by commercial poultry farmers for years now and we in the industry are wondering why Kenyans are so worried about possibility of sending this country into lockdown to contain Covid-19. We have been doing it and for those familiar with commercial poultry farming, poultry production is a dynamic process; the production environment can change and will change because of local disease conditions, for example, Avian influenza. Here are five principles of flock biosecurity that have kept infectious poultry diseases at bay.