Black spot is caused by the virus 'circo virus' for which there is no cure. However the death of the chicks or birds is usually a result of secondary infections and not the virus itself. Treatment of the secondary infections can help to save birds infected with circo virus.
Secondary Bacterial Infection
Secondary Coccidia Infection
Pox is a virus for which there is no cure, however the lesions caused by the virus can be treated with Pox Dry.