biosafety level 4 zoonotic laboratory network biosafety level 4 zoonotic laboratory network the biosafety level 4 zoonotic laboratory network is an international consortium of biosafety level 4 research laboratories. its members are national centre for foreign animal disease (canada) national bio and agro-defense facility (united states) pirbright institute (united kingdom) friedrich loeffler institute (germany) csiro australian animal health laboratory (australia)