Two more Jehovah's Witness families have been taken to the Durban High Court to force them to allow doctors to administer lifesaving blood to their seriously ill children.

The two matters were added to the court's roll to be heard on Wednesday as a third set of parents planned to defend their refusal to allow their five-year-old son, who suffers from sickle cell anaemia, to receive blood transfusions.

Jehovah's Witness forbids followers from receiving blood transfusions or blood products.

The KwaZulu-Natal health MEC and a state paediatrician are the applicants in all three cases.

Details of the two additional matters have not yet been released as the court proceedings were delayed by power cuts on Wednesday.

The matter of the five-year-old boy was brought to court on September 28 when KwaZulu-Natal health MEC Sibongiseni Dhlomo and Addington Hospital specialist paediatrician Dr Noxolo Mbadi could "not allow the child to deteriorate without a blood transfusion, which is the only option to save his life".