FlightPath is not produced by Aviguard and the only FlightPath I know of is produced by MICROBIALDEVELOPMENTS sold by Pallats and £5 for 50 birds treated per sachet. Its pretty good stuff if you are into microbes and its designed for avian use specifically destroying and preventing Salmonella through stress,breeding,racing and moult. Trials were carried out in 2004 and were found to increase racing performances although I dont know how they could compare past and present results. The poultry industry use it quite considerably to alleviate disease and the makers have treated billions over the years.